Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7f4d5c2c1378d0…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 23:38:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 279411ed948cdb497ebe4d33c62d4780 SHA-1: d2f54deec42b376286bb888afdd60228f50cb7ae SHA-256: ef7f4d5c2c1378d007e83427a242a925df66eba1ebe5d932654408dfe970e9a6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=ls+823+head+specs PDF link annotation
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/aefa5b77c.pdfIn PDF document text
    • https://namovanuzo.weebly.com/uploads/1/3/1/6/131606642/5090287.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/sail_race_rules.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/fudenumuf_taligasupoviwod.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/barrons_ap_calculus_chapter_3_answers.pdfIn PDF document text
    • http://kieverts.xyz/skaven_army_book_6th_editionx4bfw.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/gulilezuk.pdfIn PDF document text
    • http://regse.website/how_to_manually_install_usb_drivers_windows_8zluar.pdfIn PDF document text
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/vasis.pdfIn PDF document text
    • http://armada.technology/what_is_the_cost_of_cortisone_injection2v1ra.pdfIn PDF document text
    • https://kikuwigew.weebly.com/uploads/1/3/1/4/131407235/fenunoravaleg.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/7593157.pdfIn PDF document text
    • https://ronogutelujevur.weebly.com/uploads/1/3/5/9/135956648/11eab0e32ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_75e0de4fe7ab45b085128ecbecc82061.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1320d7-8a01-4402-a993-84049f72a991/hearthstone_ranked_percentiles_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378b02af-801e-40ab-8dd6-dcd27b93a56e/how_to_hard_boil_eggs_in_a_ninja_pressure_cooker.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_6f43f02e130441939f8278eed44278f4.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_60137043efdc4bd4b65c1d082eb3b6c6.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5464 bytes
SHA-256: 89a60dc1252f8f5878c9928d53be93b01232e1d04cc717b67efd8c3bc26f2def
font_01_sfnt_off00010448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 11392 bytes
SHA-256: 5286590ece92dceec815926c7fda8270476b48b0c8c59105c04207902d83ad3c

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