Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a7194d2746cff0…

MALICIOUS

PDF

94.6 KB Created: 2021-03-31 03:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8d6c5ba7ca45f20320fa633a4b7f281 SHA-1: 71538d0fba7d3b29a2d178bc4e94fbcf78a7edbf SHA-256: c8a7194d2746cff053142f862da55bb46d53f77a2b6b850d2f4bf55a1f5b3f3a
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 0.9997

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://leonvi.ru/award?keyword=bonsai+carmona+microphylla+pdf PDF link annotation
    • https://tiketarutuluvo.weebly.com/uploads/1/3/4/0/134042831/mulufolakevul.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/dajepuresowut.pdfIn PDF document text
    • https://jamofavoxaf.weebly.com/uploads/1/3/4/6/134698870/e5e6c3c34.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/0iGlkhd/alien_blackout_story.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvazilu/fQggfEc/gorozelebobolazeroni.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/961b4.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/gHZvNgj/summer_camp_adventure_activities_fun_games_to_play.pdfIn PDF document text
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/dupin.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/icjd1sO/piano_music_for_studying_mp3.pdfIn PDF document text
    • https://devejibotabakap.weebly.com/uploads/1/3/4/7/134702496/zolapibiva.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/3hdmZYM/best_2d_shooting_games_browser.pdfIn PDF document text
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/5226547.pdfIn PDF document text
    • https://jijoromosuw.weebly.com/uploads/1/3/4/7/134714512/kazevogiligo.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/yOje75P/36455339445.pdfIn PDF document text
    • https://pivazadigemeza.weebly.com/uploads/1/3/4/6/134642233/soruvufotisemeza.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/kTi3ljV/argox_cp_2140_driver.pdfIn PDF document text
    • https://konevolog.weebly.com/uploads/1/3/1/6/131606720/sojedugupirumavexa.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/HgcEIhf/game_center_app_android.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/7486634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_12a9e15109fc4c0eb823ba9e51fd1245.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_b64f81f01c2c416089bc24a5de89b6b0.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_off00012670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12670 5544 bytes
SHA-256: 58adb6f69e9bf7e7ae383a8899be07087e3a1c61916e67259e44e0b0c450fd48
font_01_sfnt_off0001392b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392B 16096 bytes
SHA-256: f5432f4242537a928d4fe34b2b8f95d824ac6447d29bfa531a7a6c7e6fae375a

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