Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc2939ed5cd5660…

MALICIOUS

PDF

86.1 KB Created: 2021-04-01 00:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c3e8be9c4d33fa76ad3e38870247ced4 SHA-1: a0dd14ad8264a041da37bfc0587d485eecf54d16 SHA-256: 6fc2939ed5cd566097a43aee6ee70e168abc00ea9c3a6275b9953e28cfa2a6d7
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 of which point to disposable hosting and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/award?keyword=dc+shunt+motor+characteristics+pdf PDF link annotation
    • http://nasty666.space/canon_mx430_driver_downloadoorgb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5fd781422d212.pdfIn PDF document text
    • http://pitushok.space/gajurerenusdcaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ff55db38e51f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_6008b227ddd03.pdfIn PDF document text
    • http://cetapp.xyz/89457593304abxpg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6fef33b0-2c58-4e2e-a347-debf1db53974/nezaxaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfda3ea-f558-432a-a003-28d8081b3a91/9978586991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cb6e2c0-3473-4cee-a719-ad50a55a71e8/36515908014.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_2de5a5fdf2014144abd36fbfe7a63063.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd20c89-5192-4b61-b48b-09ff62e1cdbe/return_of_the_king_extended_edition_duration.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_6a53b91d13a141f090580c98e247473b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf56fd34-b82e-410b-8ebc-82fbeaee5915/7850607564.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_28e9c3beb6a54efa98d1325241e2a070.pdf?index=trueIn PDF document text
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_85a34ec905994c409a138e42af59c5e2.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_9c6b91ed2b66479ba78df778e946f57c.pdf?index=trueIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_9b641d0614c7477382a8b43e384ab0b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/403f4428-1db9-4e88-8834-23f20cbffc8c/kuwixibubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/922d3f65-b8df-44ae-a197-a59fa5c41e8c/98337109839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f26444f-bb14-4699-aacb-2f919eecea81/why_was_the_book_of_enoch_removed_from_the_bible.pdfIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_8e834a4370fa4947a60a9ce6b4b0544f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/196013dd-b23b-45da-863d-db8ae55729ee/how_to_teach_philosophy_online.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_49b6c7eeec204d31a21adc1916bc2de4.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
    • 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 5244 bytes
SHA-256: f7c08bb5df2584ba78b00f5e40531d21904ae60a20c599269aaf548fb154680f
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 11308 bytes
SHA-256: fdcba1ff0335bb31bcad9ca8798b735dd15c51258d85788ef9bf4fc772d3bea9
font_02_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 16192 bytes
SHA-256: 74a35dcac671789a1952909c7064e8f0092ccf84988030a41650584fa1b75142
font_03_sfnt_off00013c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C86 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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