Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae42a1682fa15f7…

MALICIOUS

PDF

86.3 KB Created: 2020-12-17 00:07:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5bc8a86a914d57646e39d5e4738963 SHA-1: 74eb9fa469ad4195d13efaf2ba7636379d0dc0da SHA-256: 6ae42a1682fa15f75c1c6911b515819985a4ec5e5ca24be8d0601fb57e3c62ba
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/aws?utm_term=land+registry+fee+guidelines
    • https://nenarixu.weebly.com/uploads/1/3/4/8/134899789/19fb0ba5edae7.pdf
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/6982054.pdf
    • https://cdn-cms.f-static.net/uploads/4452148/normal_5fa88a0d7c238.pdf
    • https://cdn-cms.f-static.net/uploads/4408180/normal_5faf6ed565c31.pdf
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/xemujot_zojitidazefad_nosadomelivur.pdf
    • https://sotalopi.weebly.com/uploads/1/3/4/3/134345355/jixasukutuxepanubo.pdf
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/kumipoxo.pdf
    • https://cdn-cms.f-static.net/uploads/4385010/normal_5f8e3a516563f.pdf
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5fba1fd3aa688.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8cc1c36835f.pdf
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/larukanudefubub_jadasubolo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/12570e8b-bdc8-45a0-a865-ae1e0802fb52/57844940067.pdf
    • https://static1.squarespace.com/static/5fc170e692c50b1a1e7b565d/t/5fc2ce70cb3e0f5771ad1e82/1606602352489/wizixonijenanituramofej.pdf
    • https://uploads.strikinglycdn.com/files/fc361907-7336-45d0-8649-4f50b273ab65/butezapirabebasikaja.pdf
    • https://uploads.strikinglycdn.com/files/640fd83c-837c-4075-88b2-d2d1b455528d/frank_answers_phone.pdf
    • https://static1.squarespace.com/static/5fc0b544c89e1c4b8fbd6471/t/5fc17091a97599144e2dc16e/1606512785795/tablets_vs_textbooks_articles_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108fc.bin
229d66787b755d790789c373124fe2f73889676225c47511546c6ea679a689d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 4892 bytes
font_01_sfnt_off000119aa.bin
9c83cf0607611e38277af0ff3ed0e28a67b05ba59425abdd583e6ea91b9766e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10732 bytes
font_02_sfnt_off00013e47.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 4324 bytes

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