Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c855faf98da3aa…

MALICIOUS

PDF

63.8 KB Created: 2020-12-18 19:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 05cc5a40e6a67126926f9f010610eb1a SHA-1: 2201c882ff38eb8a18de124e6a252b1c166a9ac3 SHA-256: d4c855faf98da3aafe4a3546f05000badc84ede4ad66bcac2ff549fd6dbacf3e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content, aligning with a spearphishing attachment attack pattern.

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://traffine.ru/strik?utm_term=hunks+workshop+game+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469828/normal_5fa3415c9dac9.pdfIn PDF document text
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/0b992399efd1c5.pdfIn PDF document text
    • https://mesobesin.weebly.com/uploads/1/3/4/5/134590010/nasoromeb.pdfIn PDF document text
    • https://nabisipiguges.weebly.com/uploads/1/3/4/4/134432296/1964102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422148/normal_5fc0a2dcdd419.pdfIn PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/4753831.pdfIn PDF document text
    • https://nusokusin.weebly.com/uploads/1/3/4/3/134350978/gesujodukanukunava.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/robumuduluwise/5995768305.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/misanufovekoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/mojidufiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/estado_catatonico.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/asoka_movie_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89016e0e-7ecb-4049-ac51-26013ffba0dc/23685498898.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_off0000bace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 5460 bytes
SHA-256: d59baea3aee3732ddd10517b7c81b525c6b4e36535032716857efeff26cb62ec
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 11028 bytes
SHA-256: 6c2a0566a924b5f981609cb8ff51d1f2e31a798a765ec2afde7d630f52af420c

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