Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0e56789df31f36…

MALICIOUS

PDF

66.9 KB Created: 2020-11-24 10:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a1ad8934bca1d2f87840bd627861406d SHA-1: 0652017f443150b86b032071bfb408e71e1bce25 SHA-256: 8f0e56789df31f36d61073a33561ec9d2ede5b0566067ae3f0812fccd652ed30
214 Risk Score

Malware Insights

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

The PDF file contains a link farm of 24 external PDF links, with the primary malicious redirector URL being https://cctraff.ru/strik. The document body, though heavily obfuscated, suggests a lure related to 'Melissa and Doug easel assembly instructions'. The presence of a malicious redirector and a large number of linked PDFs strongly indicates a phishing or scam attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=melissa+and+doug+easel+assembly+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_5fa46f8b08253.pdfIn PDF document text
    • https://jurexufibemoso.weebly.com/uploads/1/3/4/3/134310147/9f7270d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5f9c0a70b8a86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452863/normal_5faa6cdba1f12.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/a1f92243-753b-488e-a6ea-82350140e9f8/sims_4_crown_cc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c5c27e-c75a-4c01-8620-f40da55db678/lisudeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/69982057420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125ea474-0ac2-4705-bb6f-edaf0e68f06d/75638700660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de9e984-1659-44fb-8156-328e21726604/lp_price_guide_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79bf6d9e-d85e-4827-bfe2-1e44ca1fae8d/sugojarumipifusa.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/centrosema_pubescens.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/60429442958.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_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 5508 bytes
SHA-256: 361546fae5dc3ba33a1e5fc624bc2d4532ad6d0d6f4b8e9db648415bc91acea9
font_01_sfnt_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10872 bytes
SHA-256: 5eccaf78e61b448d9392148fb41fc1880380e2c60fa79781fe802b1636f72fcd

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