Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81f9377d545752…

MALICIOUS

PDF

67.1 KB Created: 2020-11-25 02:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cc0b1549f9933ae88264f964d7603960 SHA-1: d0dd6ec64346490d250e4ae07cf4436f43b164e7 SHA-256: db81f9377d54575240367df7f3e54ac53fcf2f34a95a992aeb95deca6db686cc
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://trafffe.ru/strik?utm_term=what+was+the+anglo+saxons+lifestyle+like PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460963/normal_5fa84c3f2d679.pdfIn PDF document text
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/11d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485942/normal_5fbd90252574d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500897/normal_5fb6d8612f24e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f9adc8ad35b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f9a22439a89d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_5fa05a3181a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f8742db2af36.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/6875f192-e344-4c04-a57b-797a421b6f8b/65102184493.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/first_500_prime_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fdd8eb-ee87-4d7a-b211-00d895b261af/antonio_dominguez_hidalgo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e27678-8085-4ee2-85fe-94c2ebce42e7/minasovoxuber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534562d0-8b80-41dc-8695-a001e7912067/77109848527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0894090d-012a-4985-a897-6f0ae8fa4246/83608492774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab57300-31d6-4682-86e2-6779ecc248bb/73978461339.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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 5272 bytes
SHA-256: 7ac1b468cdd337848c244659d14fab358389f9d401e2fcbce89c7cb3fc82249c
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 10032 bytes
SHA-256: 5a5a085a8b0c97856bd417c3d454fbf47f772d27b220decd2cf672f65467dbe0

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