Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8f24ff2b4aa8aa…

MALICIOUS

PDF

79.0 KB Created: 2021-02-24 07:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c39ebc4d02a6a4d1799af5b5e012763d SHA-1: d3822f194a4caf76e2b6bfa3df26cf50d9384367 SHA-256: 9b8f24ff2b4aa8aa81b2514daa78c73f32a6f3714445cfdf10f1169fa6bcb6d5
176 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. It uses a callback-phone (TOAD) lure. 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 0.9995

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maypoin.ru/strik?utm_term=can+you+plead+nolo+on+a+felony+in+ga PDF link annotation
    • https://cdn.sqhk.co/bomoxale/dIjyjfY/gopro_max_360_video_editing.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/idohy8R/gobexutixevomebiran.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/b3jaTKC/mosojidub.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/bb4dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_6031e4164461c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_602073c7891e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426425/normal_5fd02c2eb7459.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/VGpHd4r/61788127520.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegepemu.rf.gd/95291025460.pdfIn PDF document text
    • http://kowisefofob.epizy.com/69337686412.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_off0000f90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90C 4944 bytes
SHA-256: dd4df61b4a51f0c4ddc1774c80ebc35eff720fd9063e17a77d7ac19d0b00f389
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 10916 bytes
SHA-256: 4b6673bd488045338420df5dc8baa7c465f5dcd2db4025487e221653fd4d2ad1

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