Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1ce90c80ffd9e4…

MALICIOUS

PDF

76.9 KB Created: 2021-03-01 22:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 184b03cf8b59281b70d4884172ece3b3 SHA-1: 3f9511cfc90960d3b045cde1ef1643b7c644e28e SHA-256: 6e1ce90c80ffd9e4d7d6a4d09acf101f7bf4ab3d505a8fc3c6fadbf4c9a3461d
244 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://dafemum.ru/wix?keyword=scythe+2+player+board'. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/wix?keyword=scythe+2+player+board In PDF document text
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/nubakek-kukaval-pebofaxefutuzux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fd911c506f5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_5ffad966a291e.pdfIn PDF document text
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/rodajed.pdfIn PDF document text
    • https://nifisutabunus.weebly.com/uploads/1/3/4/6/134634245/2977293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369786/normal_6037a88470a5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fcf75a59715a.pdfIn PDF document text
    • https://cdn.sqhk.co/rizitewav/gfIhg5G/word_connect_money_scam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_603c86ff52412.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/wirexokap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fdb8a85e4f2f.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/xudakapas-jurelewijaj-xuguwewa-vuwepug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412158/normal_60067ff517199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segoxegigo.epizy.com/59716320403.pdfIn PDF document text
    • http://fisuzes.epizy.com/caquexia_cardaca.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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 5460 bytes
SHA-256: f596670a10c457a93901e5b41a46da95e275b6375cf93cf2d0b128c499de27d1
font_01_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 10616 bytes
SHA-256: 4dad19f3e6669fce501e63eaa7b6b50cad1c424428b247d8fb86aeb0cd3b15a5

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