Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6276df1cc11aad…

MALICIOUS

PDF

77.1 KB Created: 2021-03-25 05:21:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 107254a126ae88a74505df7f505e585f SHA-1: fb410abec2dd73f22983b6c1071da1a34ea4fcbe SHA-256: ab6276df1cc11aadf029416004b3c6c2d4a8b2ddd533ea088e65698e0d11be8c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=amc+8+2020+score+release+date PDF link annotation
    • https://cdn.sqhk.co/naxupowu/a06jfW2/nozewufetadoxewiwor.pdfIn PDF document text
    • https://cdn.sqhk.co/kujexelorite/ZhdSkKo/tukelikaluxef.pdfIn PDF document text
    • https://jowomuzixife.weebly.com/uploads/1/3/4/6/134634296/xijinevuzafof_gowuresi_zexakafelenu_vonekagewoxod.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/eff8381ac.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/3b94e487a27d.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/bhejgdo/formula_street_racing.pdfIn PDF document text
    • https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/f7abcc14f8369.pdfIn PDF document text
    • https://cdn.sqhk.co/fudopalizew/a5o0Wif/board_games_store_near_me.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/9066496.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_5b6501b18d084d069c75ddea5aece008.pdf?index=trueIn PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_e8c60ee26476477389a0eeac5867ce0f.pdf?index=trueIn PDF document text
    • http://wudumiwetoveri.rf.gd/artikel_pendidikan_agama_islam.pdfIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_f01a4311ce784b7a872e500545bda696.pdf?index=trueIn PDF document text
    • http://putojoner.rf.gd/ecological_modernization_theory.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_680d05734d1548829fd367560e491491.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2456591-2355-43ba-82cb-ffc34d2581be/core_java_interview_questions_for_experienced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed1a6a9-2593-4e4e-a22d-37abf1639de6/54999726290.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_183a1817ad8d430a9e1539cabf65c915.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d11242-1907-4d5b-b232-886d995b105e/simplifying_trig_expressions_calculator.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_aeee8b186c554854bcd5c29cdbed258f.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_e49c38ae7c8a4bc6b6ba0979beeb0dd6.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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 5544 bytes
SHA-256: 9a62b18c5f3b1f473178feaa47bab6718e5a487d467085c3bf4bd0a57edaa714
font_01_sfnt_off0001020d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020D 10632 bytes
SHA-256: c220942bceb63f2c656d591166f716a597bb605a6969e7daeee91acd4f14424d