Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37f9c056b8c5fca…

MALICIOUS

PDF

73.0 KB Created: 2021-06-02 04:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bfefebf8a8a948e5c6366cee297bc6e9 SHA-1: 1d82edf548fcf5e1ba7329c6fdb436c0d46a4401 SHA-256: f37f9c056b8c5fcad27cdd5e420a4dac88c31d0cec1c9d27f1df0f29104930f0
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, specifically designed to trick users into downloading content by masquerading as a service manual. The presence of a large number of external links, many pointing to disposable hosting, indicates a link farm intended to obscure the ultimate destination and potentially distribute malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=2000+ski-doo+service+manual+free+download PDF link annotation
    • https://bufasadapigeze.weebly.com/uploads/1/3/4/3/134307931/ad3c5cfac8a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454046/normal_5fe45dcfc867c.pdfIn PDF document text
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/51997bf.pdfIn PDF document text
    • https://zorazuzibenad.weebly.com/uploads/1/3/4/6/134617736/22acc47a6278ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426696/normal_6019cb40b8628.pdfIn PDF document text
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/samogenofajijopiran.pdfIn PDF document text
    • https://wuguxobexo.weebly.com/uploads/1/3/0/7/130739488/d0cf332534.pdfIn PDF document text
    • https://semezuzuxikazug.weebly.com/uploads/1/3/4/2/134234688/gavis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_6025f5589150a.pdfIn PDF document text
    • https://zapeledi.weebly.com/uploads/1/3/5/3/135314532/kavaxej.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/8078245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5fdbde4098a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_605af876dc1fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5feffc59a3904.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/b773a9ec-69ea-4df5-b103-6119c35d07ba/26_saatte_on_parmak_reniyorum_yorumlar.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/f/99265543023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa47586-8bf3-4825-bc20-ffa9881a5df1/transition_words_and_phrases_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3596fce-6b13-43c7-b24e-a01de6149e25/what_are_the_elements_of_psychoanalytic_theory.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144486912/12443004633.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/avondale_elementary_school_auburn_hills_mi.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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 5592 bytes
SHA-256: b5d3bcd20c9a6c92e491d9b929b8597160a4b863d3075dfdaac3d49a67939014
font_01_sfnt_off0000f2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 10660 bytes
SHA-256: 1f4f484936265041ea8a7ee2044960bfd6d23a6b51b8d8d2354380d58cdb8b9b