Malicious PDF — malware analysis report

Static analysis result for SHA-256 91233ac04697b26b…

MALICIOUS

PDF

104.4 KB Created: 2021-05-28 23:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8256dee522cb2e2c7aa24528517a6636 SHA-1: e1f234d508891731ea410f92f6611189d92a0804 SHA-256: 91233ac04697b26b94b81175dd7f3667259a2828f2ac48e70b134e4bc1bc15a8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/123?utm_term=agneepath+2012+songs++pagalworld PDF link annotation
    • https://levoveto.weebly.com/uploads/1/3/4/8/134897684/4353787.pdfIn PDF document text
    • https://narimokilef.weebly.com/uploads/1/3/4/6/134603618/a3f97.pdfIn PDF document text
    • https://kilogabofavelu.weebly.com/uploads/1/3/4/5/134589148/sevafab-vunajuzam-lilafom-kufos.pdfIn PDF document text
    • https://venujavuzuzejo.weebly.com/uploads/1/3/0/8/130874514/5945051.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/rapefinitakelurirazi.pdfIn PDF document text
    • https://mafupalitofix.weebly.com/uploads/1/3/4/0/134042392/pizupunovamalezuxuma.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/sekedopi-tamida-wasiwu-tiwesejo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f7aefd-e3e8-49cf-b452-c398ca0b851b/68234362054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6925ceaa-c4cb-4eae-83ab-eb4a72a2d242/law_books_background_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f279aca-b4f3-4b0b-9e6e-c69a135ce911/mechanical_engineering_internships_summer_2021_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebcf313-95a1-4acf-a813-fe8d81e63f47/bipetizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b88f4b-ce8f-457e-b5ae-4db364957567/coste_instalacion_caldera_gas_natural.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd898450-50dc-4e15-87dd-3a549b220b25/setafirarakodogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c3a6c3-80d3-448f-a003-7f0d59630944/deere_employees_credit_union_online_banking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5679b451-1092-4aec-a340-4e9985be7606/ripirowujazofutod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba030b8-8b07-43f5-8dc1-088f00c02b86/cva_wolf_stainless_steel_camo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080de6fe-692e-42af-92ec-a0baa54cf9e0/how_to_set_timer_on_delonghi_dragon_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae725284-55fb-4f1f-9f80-b70b1bc2d852/25750051268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56795c42-5f5a-4c4d-ac72-69db07dd2dfd/what_is_the_definition_of_divine_intervention.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efe85e3-caae-4bd8-bb4d-7aef54ebf0df/humnava_mere_mp3_ringtone_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381a6031-44cf-40b8-ae20-edd7c5bf019d/50953250681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5abf993-ab18-4c00-bd14-667eacbcbe91/how_to_write_file_in_java_using_itext.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d35200d-5503-4485-b15e-b4a0b14d6bb5/55433859831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/081f0d3b-f881-43dd-8583-01a4deafce17/sig_sauer_p226_.22lr_10-round_magazine.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 5628 bytes
SHA-256: b63762132d014ed5bf59d2fda89a0e6524315ef1f7e609c0293bd83cd9c874d4
font_01_sfnt_off000143ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CA 12052 bytes
SHA-256: f84567202bb7a0b8ab049832f3fc0ad6e223cb6eead7bdd262f0f0be85dc1c67
font_02_sfnt_off00016d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D28 16328 bytes
SHA-256: 27724f8b2d9f56efccdafb33f6851a4b2a19bc2e2a80df2fe1c7f1d4b3c5a6f2
font_03_sfnt_off00018320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18320 4248 bytes
SHA-256: d53721cd472386b32a2c2dfc5a8b2fa6df84bbb6571e4e03f7fe88bf8888ec0e