Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb61bde13091f4dc…

MALICIOUS

PDF

64.4 KB Created: 2020-11-18 00:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f5fe5bdf7c4df284c4946a45b1723310 SHA-1: 7b94deab5a0f124a6a2a02605f2d25e300b1ab07 SHA-256: fb61bde13091f4dc3ac47932e97d1c167718fe73e9e45c24863048ef85178481
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://traffine.ru/strik?utm_term=nazi+zombies+portable+download+google+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458827/normal_5fa9431d22ab4.pdfIn PDF document text
    • https://kegibaxita.weebly.com/uploads/1/3/4/6/134661687/a53e76c.pdfIn PDF document text
    • https://xewurilarigifu.weebly.com/uploads/1/3/4/2/134236076/10995e6.pdfIn PDF document text
    • https://nulosumewure.weebly.com/uploads/1/3/4/6/134645663/928a9c5.pdfIn PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/3153540.pdfIn PDF document text
    • https://kotuvowomikek.weebly.com/uploads/1/3/4/3/134370123/wujep-mikobokemadiwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418192/normal_5fae47e2241ee.pdfIn PDF document text
    • https://jenititufevi.weebly.com/uploads/1/3/4/5/134595561/32f088b353f267.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea67f64b-cd14-4d7a-8e2c-c4b9312ff96e/14657575223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0030c0a8-01cd-4af9-9615-3bd0772d37c3/7578606243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a283d6ba-670d-43da-87b0-ad440d1fb6c8/teretirobal.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_off0000c0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FD 5592 bytes
SHA-256: 4f28d13f8f8f85508936b086e3a1e984e58d50538d0b5ba1d501c177dc78fa44
font_01_sfnt_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 9580 bytes
SHA-256: 1b1901e156a7e4e9e38f7e0fb70a07d29a63ba9ff2df162ede2ed024f744c944

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