Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d19ed4ad7feefc…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 21:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6e1153888ecffcde987e6ee05240858 SHA-1: 9211a1fdada77db238dce7c8a609e8dad2b94d2e SHA-256: d1d19ed4ad7feefc4635a734ec41b21533feded1d9cc325fa69393282aecfe97
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of external links point towards an attempt to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=manual+exhaust+cutout+vs+electric
    • https://cdn.sqhk.co/rosojolude/kfjgqIv/beboguzurirukeg.pdf
    • https://static.s123-cdn-static.com/uploads/4461202/normal_5fdd5e8d6e6b0.pdf
    • https://cdn-cms.f-static.net/uploads/4467915/normal_60542f5632b5e.pdf
    • https://cdn-cms.f-static.net/uploads/4373769/normal_603f32a86871d.pdf
    • https://cdn.sqhk.co/wanaxowuwot/XjdjhKE/abdominal_workout_routine.pdf
    • https://cdn-cms.f-static.net/uploads/4405195/normal_60248c7d807b0.pdf
    • https://cdn-cms.f-static.net/uploads/4382406/normal_60439775d4c15.pdf
    • https://cdn-cms.f-static.net/uploads/4383131/normal_600dc69d02139.pdf
    • https://cdn.sqhk.co/vedanoderifu/eYdrShe/sizonizaxaxi.pdf
    • https://cdn.sqhk.co/ruwonumatag/fuBieiv/youtube_vr_not_working.pdf
    • https://cdn-cms.f-static.net/uploads/4410717/normal_6055b4cb10459.pdf
    • https://cdn-cms.f-static.net/uploads/4408319/normal_6024b1b69b921.pdf
    • https://cdn.sqhk.co/setuboluraje/geigHrx/vufafuvorapikeraf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zugutixe/82129485085.pdf
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_d17d43c92e4442b98a05c9616dbfa510.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6bb4ade4-43ed-4770-bd86-6547fa16caba/rockola_jukebox_model_468.pdf
    • https://s3.amazonaws.com/fizaxo/tidofelonojazufase.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_42378bab6d2546d99a573c72674026c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ae1f2be-c8a2-414c-a54c-40d2e0379fb0/what_is_the_theory_of_transformational_leadership.pdf
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_e3c230cfa7c744d29da1867a8e0d2e7a.pdf?index=true
    • https://s3.amazonaws.com/bolovopizonuki/maastricht_guidelines_extraterritorial_obligations.pdf
    • https://uploads.strikinglycdn.com/files/7f81b55a-6fa6-4775-b448-ff93fa10b6e3/cerebral_palsy_types.pdf
    • https://uploads.strikinglycdn.com/files/951f2369-20dd-40e4-b747-f02c26a168b9/how_to_change_password_on_netgear_n150_router.pdf
    • https://s3.amazonaws.com/bidemewufa/assignment_title_page_templates.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fa.bin
f1b951fe0d35c111b116315c1448812388de060b831a757099f7d19884a9cb6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 5020 bytes
font_01_sfnt_off0001071b.bin
6aa784e58b6eb69953de5082023748db04888ac3406aeaf3cafa2af6ebc9ab7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 11256 bytes