Malicious PDF — malware analysis report

Static analysis result for SHA-256 4892508c01e81b87…

MALICIOUS

PDF

91.8 KB Created: 2021-03-27 22:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 737b8a12303f2a2349484de82deef2df SHA-1: 20e826b04ef982688710b625172cff6c9d63fb76 SHA-256: 4892508c01e81b87e9dabc0ebd390ac9dd88a06a2a6ded496a60dcf443c6d898
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. One of the embedded URLs, https://zajinet.ru/wix?keyword=coleman+power+steel+swim+vista+series+filter+instructions, appears to be a lure, masquerading as product instructions to direct users to a potentially malicious site. No scripts were extracted, but the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=coleman+power+steel+swim+vista+series+filter+instructions
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/lotapadokoga_mumovorogud_kurezawidatejur_woped.pdf
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fe6166692aca.pdf
    • https://cdn-cms.f-static.net/uploads/4469836/normal_601f2795aedbd.pdf
    • https://zuxidonav.weebly.com/uploads/1/3/4/8/134867872/8621010.pdf
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/tawafufujeluwe.pdf
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/rokefiwidojoxeb.pdf
    • https://cdn-cms.f-static.net/uploads/4408858/normal_602c45b8e3db4.pdf
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/baboropu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/cea44e53-3364-44e5-a7d6-894f75cc7904/algorithmic_trading_c_books.pdf
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_e62f2b2a3fd14db7a0b8476641090373.pdf?index=true
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_f03f9c4edd3b4c768129018f42500531.pdf?index=true
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_7cacebc1edc24bf5bbebd10791c144f5.pdf?index=true
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_a045304aa6d44ab5a4af9f62f6302d09.pdf?index=true
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_9d6c2426ce33455a82b9e758c4c8b465.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4149fcab-65ce-4b16-a671-e719b3556664/pileletaxovi.pdf
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_3a65c79a945747d8a08380f0277107da.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_8586fd827e604fdda42c261ebc8a1fd6.pdf?index=true
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_ade0010f30c942f48fb55237fb2a2c3f.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_963d1d0c500042b9871e1e852f557640.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8312a0bb-000b-442d-9540-a5e330587fcb/41592380094.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_5b275cbbf1a94ae28cfb03212992b78d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011649.bin
efcdd33e04e9057a02b48bb27ae4d47480da6e7e133115f52ab24b9cddb940f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 5216 bytes
font_01_sfnt_off00012804.bin
4535c19207c75f642971a9f5889f2cfced6b33df72b5fa520b3bfaddf9c511d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12804 12828 bytes
font_02_sfnt_off0001534e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1534E 4324 bytes

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