Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5fd1af28ded10e…

MALICIOUS

PDF

67.8 KB Created: 2020-11-26 07:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7d0d954e5501cf49c7e477be0a08351c SHA-1: dd78536f58a24a0c5852802c18304c9b18b1c7c5 SHA-256: 8d5fd1af28ded10ed108f781e603d5b3bc7da7adea17f1047765314e78fb0ace
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 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/strik?utm_term=skyrim+night+vision+not+working PDF link annotation
    • https://lewobagapu.weebly.com/uploads/1/3/4/6/134666085/vosizere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_5fa64f232b218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5fad97e648d9d.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/8313917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8ace3ef237d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_5fb52a62c26b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_5fa9ac16d5dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_5f8d5ff418265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5fa22da9b585e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_5fbc89656ac92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_5fa28b261fabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fa5a77273e35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/tevodif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86537f07-c133-43af-abf1-912f1a47843a/rufakefuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563b90c5-f6f2-4e92-8b55-14c08505ac66/vajefezufuzawixatakidotum.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_off0000caae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 5276 bytes
SHA-256: a3b899833ca42653ca6723f497026e7e7caea233d74f49e739eb7723ad8628f6
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 10644 bytes
SHA-256: c119b1294ab7830d6dd290e488c285d06f796a28b58355edace487b59a74179a

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