Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa72d8b73a7eda5d…

MALICIOUS

PDF

77.4 KB Created: 2021-04-04 13:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3605499ce4b88a20a634a873eef8f74f SHA-1: 84088fc784337bc14c0652e3adfebcf688bfe57c SHA-256: fa72d8b73a7eda5d0c06754986c14b614a095f86b50454de08f1bb0a28cda0fb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to deliver secondary payloads or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://dugedepap.ru/strik?utm_term=bissell+powerforce+compact+bagless+vacuum+2112+manual PDF link annotation
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/fovuwifusigoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456705/normal_60513eda99b66.pdfIn PDF document text
    • http://nubidatum.22web.org/povujavefiwaru.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/ranix.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/bjgji7N/ripoju.pdfIn PDF document text
    • https://cdn.sqhk.co/jopogoxom/jidG0id/81404783422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_6013b7877dd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_5fe6d0328dde5.pdfIn PDF document text
    • http://wupofifaxixusi.66ghz.com/air_force_one_movie_online_tamil.pdfIn PDF document text
    • http://xuvivok.22web.org/gunomovegolipibovixu.pdfIn PDF document text
    • https://cdn.sqhk.co/sojebudegoba/dhdifgd/sinujelugix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376610/normal_5ffe63823efca.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/bidhj12/46105226342.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jugefewaxuxuf.epizy.com/fodug.pdfIn PDF document text
    • http://zefuxaninegug.epizy.com/diy_racing_cockpit_plans.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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 5860 bytes
SHA-256: b8adc7f59fd45c2b2c62091804c6532704c53e4aa4324809cee8a4a81f444ad5
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 11016 bytes
SHA-256: 79b1db34a6a0e7c486dbfb68f29424d0d5b3c26ee72c0c8da65bf6ff14ca86c0

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