Malicious PDF — malware analysis report

Static analysis result for SHA-256 3759d40abc33b54d…

MALICIOUS

PDF

74.1 KB Created: 2021-02-02 07:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d595e8a0f01f75aa22275d1294558d6f SHA-1: e9fcf6bebdc0d1110470c5e49fa5cf9a144f5bd0 SHA-256: 3759d40abc33b54d1464b8c35363912050a4d8792f96185c8da8670268dc278c
164 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to PDF files, indicative of a link farm or SEO abuse for malicious purposes. ClamAV detected this as a phishing trojan, and ML classification strongly supports maliciousness. The presence of a download button lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=declutter+your+mind+epub PDF link annotation
    • http://detomebokiv.iblogger.org/14875925727.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5ffc217177464.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/gjicjeF/gomudered.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/ai04Qjg/rotimadudowolot.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/jcihMmK/splendora_isd_police_department.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/hIBPy5U/sozilakawegagamed.pdfIn PDF document text
    • https://cdn.sqhk.co/jobebakegip/jjMC8tA/gowotipet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_60114c907cf66.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/jjdSrge/zisaxekapenuremigi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5fc580c8e63f2.pdfIn PDF document text
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/cafc2cb94242.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/hgeyCR7/best_free_top_down_shooter_games_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/GBBBajc/jibigararovejufekedim.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/djeaSmt/mine_world_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/vjbibth/general_electric_customer_service_contact.pdfIn PDF document text
    • http://tamekawarol.66ghz.com/fazikemixugijel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388412/normal_5fc5de823f06d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gotazuvibidok.epizy.com/animal_science_worksheets_for_1st_grade.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_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 5072 bytes
SHA-256: 9b5a9954ed026e6a81313734871e43f62cbe4ffec5803dc93e4da1ae7ef6c010
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 11032 bytes
SHA-256: a0fea844a8b9173b8e88a6951eb4353d0aff4c199b8ea9e9d021a2c2b25af3bc

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