Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f07e725c2fed5f…

MALICIOUS

PDF

74.0 KB Created: 2021-03-08 19:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: df005ad12f0a267bf360e065b21a93ec SHA-1: 24f5f31eb1b9a2f80ec11e2fa2c85c40afd62c11 SHA-256: 77f07e725c2fed5f8039bb8d092f6b8dfa2040603e6193dd0c8f0181d00ddda4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URLs, such as https://dugedepap.ru/aws?utm_term=2013+jeep+grand+cherokee+v8+towing+capacity, are likely used to redirect users to malicious sites. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://dugedepap.ru/aws?utm_term=2013+jeep+grand+cherokee+v8+towing+capacity PDF link annotation
    • https://cdn.sqhk.co/guvevifowo/jdhgZev/suludukefuwofedaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/dKiaDsp/who_moved_my_cheese_spencer_johnson_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/bigPjaV/vagibugumafatosotezujoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_6029590b3da30.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/5quheif/how_to_make_bubble_tea_fruit_pearls.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/gggijge/among_us_kill_sound_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/gxrgcgi/dufusufujaw.pdfIn PDF document text
    • http://grigolia-studio.ru/335232007319whwx.pdfIn PDF document text
    • https://cdn.sqhk.co/rotefuver/a4RrJX8/wovexim.pdfIn PDF document text
    • http://all-gopro.com/potutupikunegerude3b40y.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/haQiDuY/slay_mama_picture.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/ghicghb/31536713990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_600bffb190425.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/free_robux_hack_on_mobile3z3ak.pdfIn PDF document text
    • https://cdn.sqhk.co/kominepoli/hihhcgi/aesthetic_anime_wallpapers_desktop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_d920e4f24bfd4e769b9ae00bb6463866.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_cd334d4e163a41998e6be9b1968703bd.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_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 6108 bytes
SHA-256: 269d4076aec83bf0a6621e19046ddbc62d76900b8da2834810354ec958bbfa87
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 10240 bytes
SHA-256: 4a2604e7759e8de27ffd146b9fe546cd0d495b878c602e30ba3d35e66d0d759c

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