Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4af773ba83aebf0…

MALICIOUS

PDF

82.5 KB Created: 2021-03-31 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7a8dda74f36ed3c4c51eca4812db44b3 SHA-1: 5c040da8e79bc2c77557992a7831144e53afa474 SHA-256: a4af773ba83aebf0d63c2cfa56865d467bab4f08a39f4e32a8c750552214d34b
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://dafemum.ru/123?utm_term=android+callback+from+activity+to+fragment PDF link annotation
    • https://cdn.sqhk.co/gesokusa/fgejac7/mikusojolepugolebe.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/skyrim_dragon_language_name_generatorz0q4p.pdfIn PDF document text
    • http://lnstagramoriginal.com/what_is_absorption_in_plants2jirs.pdfIn PDF document text
    • http://9gusevshop.space/duzetabixakaluwekunanowe6xr6.pdfIn PDF document text
    • http://vunobugos.22web.org/44977976982.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/meeting_cancelled_due_to_lack_of_quorum_meaningxyh70.pdfIn PDF document text
    • https://cdn.sqhk.co/litopozuf/jItXbjj/hill_climb_racing_download_apk_home.pdfIn PDF document text
    • http://auto-agents.space/bd_govt_calendar_2019j9b69.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/hbhcghe/microsoft_authenticator_app_qr_code_error.pdfIn PDF document text
    • http://blankid.ru/zumapaserixinokuzqe13.pdfIn PDF document text
    • http://trackengine.host/83457128662v6zgu.pdfIn PDF document text
    • https://cdn.sqhk.co/dikonutudibe/dgfGHje/gaximuvuburaduf.pdfIn PDF document text
    • http://dream-stat.ru/12169975353ssvx.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/eDOLujf/bagan_myanmar_wikitravel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refowokewip.rf.gd/diferena_entre_tumor_benigno_e_maligno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0ad646-1720-4ef3-be30-53431987b293/73314204361.pdfIn PDF document text
    • http://bewimovope.epizy.com/libedotozexita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72472515-3b75-4b46-8b51-141c6d467988/76590735646.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/11202339944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810276e1-33f6-4599-b4c7-48196c8d4ece/how_do_i_program_directv_remote_to_samsung_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22681296-8646-4459-8193-b122394efef6/how_to_cite_mendeley_in_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/nikon_d5100_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371380c9-e77f-45ba-9e7d-866a07afb15b/brother_p-touch_pt-1290_manual.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_off0001051d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 5520 bytes
SHA-256: 2d7a0926b439dd41945af257e24da26701601183a4da367b152a38b4ef76bfe1
font_01_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 11160 bytes
SHA-256: b5378e051dfe53dfc40c53764e55e480c44a0d77c38e13894556c7759c3aa272

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