Malicious PDF — malware analysis report

Static analysis result for SHA-256 f411ca263f62afe5…

MALICIOUS

PDF

66.9 KB Created: 2021-02-19 09:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b6efb8814ceff0b1a72fcedee3b1a748 SHA-1: 0cd23fa7954d0af0ae43b0fbc63977ebd1fe45e4 SHA-256: f411ca263f62afe564adee524c2ca44b5bc7d21a0a433f9937e18fe0de4c91bc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://druttle.ru/wix?keyword=it+all+adds+up+science+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fe3ef24aa425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_600ff9f63accc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382953/normal_5ffaf08d81810.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446378/normal_6003644fa1524.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/hfLgfvb/lego_hidden_side_castle_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454545/normal_5fc6b03877dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_60260e1830415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_602653759eed0.pdfIn PDF document text
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/99ed96edd88d401.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/iaiiUzT/mefigesenu.pdfIn PDF document text
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/3734661.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/a8jglgj/66984481031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_5fe909bc57e61.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/mukut/29647159889.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/93872862855.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/70085978383.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/biwibagezogibagabugax.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/adairs_jersey_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/62598555562.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_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 5356 bytes
SHA-256: d132f37c21e2779e75ade3b366f98b021b6c488f8d6f0839e0281ccf07236f49
font_01_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10052 bytes
SHA-256: 1dc9e82612b033a11e8cb886805fc12925714ae8d29a2b061a29a0fd73cf7778

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