Malicious PDF — malware analysis report

Static analysis result for SHA-256 3141e2622c94a93d…

MALICIOUS

PDF

84.9 KB Created: 2021-06-14 09:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae5a42e5b280ffe98a1f6c54d28fc691 SHA-1: e44a78079258425908822d508c63dc4eb8a80cdc SHA-256: 3141e2622c94a93d3560e8b4b9c73db87cf0f44c88c1d880d95a85f3a00eabcd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=caples+lake+ca+fishing+report
    • https://cdn-cms.f-static.net/uploads/4389358/normal_6012b2a783b63.pdf
    • https://wabalunizuwa.weebly.com/uploads/1/3/4/6/134643533/kujena.pdf
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5fca662abd8b4.pdf
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/gesotuzuwa.pdf
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe24de21ea2b.pdf
    • https://lisebozaran.weebly.com/uploads/1/3/4/6/134694889/8408646.pdf
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fd67d1f584dc.pdf
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/gutumudog.pdf
    • https://static.s123-cdn-static.com/uploads/4460970/normal_5fcea398e7eed.pdf
    • https://cdn-cms.f-static.net/uploads/4391327/normal_600e62f573fa7.pdf
    • https://wiwamimojuwat.weebly.com/uploads/1/3/0/8/130813692/pekobumope_soxus_vuzipe_jugujoserana.pdf
    • https://molipose.weebly.com/uploads/1/3/4/6/134644393/8124468.pdf
    • https://static.s123-cdn-static.com/uploads/4401692/normal_5ff78511a8882.pdf
    • https://static.s123-cdn-static.com/uploads/4381788/normal_5ff7c324ecc3d.pdf
    • https://cdn-cms.f-static.net/uploads/4474192/normal_600eafdc3c3d2.pdf
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fd1ce21d8e2b.pdf
    • https://cdn-cms.f-static.net/uploads/4468289/normal_5fdaac1f577fd.pdf
    • https://kixufeme.weebly.com/uploads/1/3/4/0/134018387/d0b67.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rutarotovez.pbworks.com/w/file/fetch/144646065/xawogaluxem.pdf
    • http://bulafiko.pbworks.com/f/luwuxoxovaluw.pdf
    • http://tejipufiwuma.pbworks.com/w/file/fetch/144982299/36247323635.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d19.bin
713a45d0fd577f3b9f840a2d3f4b86d68a6082e62400f92fae8542f9250c9c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 5244 bytes
font_01_sfnt_off00011eeb.bin
efafd43544897994350693cc2d7ca09113573d97249c45b1d9dc81415fcacab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 11212 bytes

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