Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb4221f3dbb4676…

MALICIOUS

PDF

78.0 KB Created: 2021-02-21 12:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8aa7e65f9d6303db1020675d873e911a SHA-1: 2f2b2f3e69416d7729eb96dedec4253820eaf043 SHA-256: dcb4221f3dbb46769f66e0f985b7509fc3adf7cb81eb58ca7421165bacc6657f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=american+gods+cast+season+1+episode+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5ff405f87b10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_6025ddcbb2757.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5ff1dc348bf18.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/abede6.pdfIn PDF document text
    • http://tehnotop.space/leadership_interview_questions_and_answers_samplebwf19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_5ffbeba251f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481158/normal_5fc6b1bf089a5.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/3f133b8e3a64e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fdc1956a06d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5fe3a1bf4b7ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_60001faf4b1d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_6031f475cedfd.pdfIn PDF document text
    • https://sikapekit.weebly.com/uploads/1/3/5/3/135317012/3897145.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fdda4ccb7869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wovigebi/fashion_designer_portfolio_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/conceptual_physics_chapter_6_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/pugemarexapak.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/does_cigna_pay_for_marriage_counseling.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/hypothyroidism_diet_plan_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/child_benefit_claim_form_ch2_po_polsku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 5316 bytes
SHA-256: 4778f975a7bd9f809a149344b9c08c29cb93fac2b8f28ad899f4ede5cb8be46e
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10596 bytes
SHA-256: 397e1987cc54c73ef9559ed48451adeec81a2bd2040672e038724277058a9c05
font_02_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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