Malicious PDF — malware analysis report

Static analysis result for SHA-256 0725bb13d240cbd5…

MALICIOUS

PDF

90.2 KB Created: 2021-03-16 06:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 86420d8b0fc720176c100096bbe1f400 SHA-1: e51decd56356d78d1826209a88e7cef453ce1aa6 SHA-256: 0725bb13d240cbd58a0dbd47a415e82888a50e8644bb16b65ab00e23887095f6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/wix?keyword=south+canton+scholars+dress+code PDF link annotation
    • https://cdn.sqhk.co/pumafuki/TihQ0Rs/35331699492.pdfIn PDF document text
    • https://cdn.sqhk.co/nubalevuvem/ahed91v/us_air_force_military_ranks_in_order.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/egf2ieU/xifetopagujivegetose.pdfIn PDF document text
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/41236deab.pdfIn PDF document text
    • http://acupofjacob.com/anker_soundcore_2_bluetooth_speaker_manualvzy88.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/normal_distribution_table_percentile3bt13.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/xajuv.pdfIn PDF document text
    • http://cardio-active.site/dell_compellent_sc8000_user_guidexmgtq.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/mhcgh4j/sukelopefanefuligup.pdfIn PDF document text
    • http://elinekici.online/laralikiwovejurilavikov5nw5.pdfIn PDF document text
    • http://onsideball.info/29636527150e8xe0.pdfIn PDF document text
    • https://cdn.sqhk.co/tamenotu/Y7rjLgf/shadowverse_liquify_guide.pdfIn PDF document text
    • https://bukenazupe.weebly.com/uploads/1/3/4/5/134584610/1199226.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/juzike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/83823243667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b888a81-b988-41f8-b85d-a754169b5626/how_to_change_light_bulb_in_round_nutone_bathroom_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11c12910-0c34-4b8d-948c-b218d05928fe/4412787709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9a0899-333d-4568-8297-dfc8d1c6614b/xuzapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f6cadc-ca4e-4912-8b83-63ac88a7e620/12897294004.pdfIn PDF document text
    • http://visugog.myartsonline.com/memory_techniques_such_as_the_method_of_loci_acronyms_and_the_peg-word_system_are_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671c2afa-d91f-4ebe-90ea-5780c373f0e1/where_can_i_learn_sword_fighting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cb4830-f862-4c50-a896-e5a8647d1f81/rain_dial_controller_manual.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 4100 bytes
SHA-256: cf8709790a1b2e361c4161ae757eca2a7cd4e620ba599a51b5c25fc82c051d3e
font_01_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 5128 bytes
SHA-256: 00e07df083f7d5164e876b97d57b177cadc0c9e457809e2fbea742e555509f12
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 11692 bytes
SHA-256: 73609bcc2801ed0efd87943b4750ffb5f97c095843def500dc2a9bb127315b93