Malicious PDF — malware analysis report

Static analysis result for SHA-256 667e10bce74f18e3…

MALICIOUS

PDF

123.4 KB Created: 2021-03-11 09:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8336515661099d59b0995000290674ca SHA-1: 10dd4abcb036814f47a21ec741d7e9d1c84bacfa SHA-256: 667e10bce74f18e39731a606ea2ca497452306e1d0e311f3ea1eaba3197297df
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=structure+de+la+cellule+animale+pdf PDF link annotation
    • http://byseles.xyz/battle_up_marinessin6v.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/WGgjv7d/seripasijexeligexebopan.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/W1XQ5ps/stickman_fight_shadow_warrior_mod_apk_android_1.pdfIn PDF document text
    • http://uablog.website/97758296119om17q.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/iKjedig/linupijasovemomobejafedop.pdfIn PDF document text
    • http://counterman.ru/gogotevudi0rawx.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/gj9gfNH/beijing_olympics_2022_boycott.pdfIn PDF document text
    • http://volosaty100.xyz/ante_nicene_fathers_complete_setwn8nx.pdfIn PDF document text
    • http://ufenmac.com/blood_bowl_2_necromantic_set_up3ndbg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70888fa4-3854-488f-ac21-81e271de782f/daily_language_review_7th_grade_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/kuvabozosoxegumaweripux.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_878d07c9f33243a490cf69fd289f7dcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/dilemma_of_a_ghost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddd0438-081e-4065-a99f-4a06d226da78/fokenadunujavaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dcab2dc-1a3c-4ff7-82cd-ffa7a99c43b4/what_is_the_most_important_law_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8765f44-8ab0-4ab7-9394-6fbcb10b4a85/75231267487.pdfIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_72dc3e5c11e64010ab230f80d198b9a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42481cb8-1849-4cf1-85d8-a3a2b65c0d7d/why_my_garbage_disposal_is_leaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7916ad7-e8b3-44ed-811f-79bda3ccf948/actiontec_gt784wnv_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd736d5-a981-4e88-8a99-8c84d87cfc1f/kobalt_miter_saw_manual.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_51be91a14d6b49d6aa3e0cf3e589bedb.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_c585ec92b19543b5b848419a83b1eb45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b32ed738-0104-450e-82ce-f7cfc048a6ac/delavusoparevameketijapag.pdfIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_2175ee17284a40dd8488c4160f18e5f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcfd66c-9214-409a-80c9-3c9ddecd613a/how_to_beat_the_rubiks_cube_in_2_moves.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19691 5228 bytes
SHA-256: 22fcf6ba8e6c54408639491abf2f444ef1e403664e45d10981217cae6b7dc741
font_01_sfnt_off0001a845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A845 18076 bytes
SHA-256: 826a069b1083090de7c6f871de287ed2dd6b07b53656b2b43932eabe1e913129