Malicious PDF — malware analysis report

Static analysis result for SHA-256 42201a11e234b4a1…

MALICIOUS

PDF

76.9 KB Created: 2021-05-11 15:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0391f533bd161f001147593eff657761 SHA-1: 6b543b0c0f7cadce60c79b97bd9db648bdeea991 SHA-256: 42201a11e234b4a1fb4d02fdc18b71f3055239f1eed7eb49838c3ba794793584
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and linked content are indicative of a phishing lure, likely disguised as product information to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wb?keyword=casio%20hr-8tm%20calculator PDF link annotation
    • https://cdn.sqhk.co/zopisipiwele/e9iihbQ/best_craft_breweries_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/hiijG9c/lisagavulapanaza.pdfIn PDF document text
    • http://alcozerox.com/how_to_install_kirby_carpet_shampoo_systemzf9zs.pdfIn PDF document text
    • http://smirnoff-optic.com/409799872036emyl.pdfIn PDF document text
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/xuzabuw-rafukimazudox-pejebumetixawos-nanoluso.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/a5a4eac314fc.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/golerapo.pdfIn PDF document text
    • https://sagakoto.weebly.com/uploads/1/3/0/8/130814189/gamafanitilobu-numelibononasaf-nadog-zerawivil.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/fca059aae267bb.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://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_1b7c63cc7c10443790de22983caed993.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_67341b4b8184450ab8acf96dfecc46bf.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_a9639d53166b41b8969141dfa9d64ba3.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_9741d158543a4affb588ad52211906d1.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_85c552e4d10248cca53b93875d77d9db.pdf?index=trueIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_c7aabd6eacaf400aae58c47692e71ce5.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_a3c51149e70d480fa955bb0aa3808cbb.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_aec2d2f6b0514942a2a1645fdc884aae.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_off0000cbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDF 4948 bytes
SHA-256: 682dbc5e9ac9a079961fe70f9ef85b6141ed48c5fc7e406de8406a7d02ba2698
font_01_sfnt_off0000dcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 11124 bytes
SHA-256: f9051c04c29dabb422c178afafa9c235e36d5ed93d8232cde57806b665495578
font_02_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16204 bytes
SHA-256: 6ff35bbcdef839a823e086214e5d609f702bf6b4484614f6c4b824d32b7fcc76
font_03_sfnt_off00011825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11825 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c