Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9944534ced44b28…

MALICIOUS

PDF

66.1 KB Created: 2021-02-24 15:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e15b9aa601b80eadbc6864f68ac37c29 SHA-1: 9546fdfd42979041d258f6117839e111207588e4 SHA-256: b9944534ced44b286b47e6a7536dd31d89ece1cfc0edf377f955879c4303cf71
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=check+your+understanding+answers+geometry PDF link annotation
    • http://nurokojo.mypressonline.com/ritetemp_programmable_8022c.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_put_graco_stroller_back_together.pdfIn PDF document text
    • http://japadalifu.22web.org/arrayed_waveguide_grating_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459640/normal_60318ccd7da44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386834/normal_5fcc41f3bb9af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503214/normal_60263ea788c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_6019bf140736b.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/zedakakuzavofesobufibufa.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/USNF3bB/navakowejamafa.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/hgiiLfr/58501344435.pdfIn PDF document text
    • http://kukikifo.iblogger.org/aristois_1._13._2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livirava.atwebpages.com/perazujakevexerixedokosat.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/wuwewasebebalubuzovubikot.pdfIn PDF document text
    • http://xuwozir.rf.gd/34031331151.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/t_shirt_sewing_pattern_free_download.pdfIn PDF document text
    • http://lejuwugumiwa.epizy.com/7571297741.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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 5484 bytes
SHA-256: 104a06c3859b2e66bdb10b313efb66c3c4a16351ad7c0b50c8e0d137ea33eb92
font_01_sfnt_off0000d6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B3 11084 bytes
SHA-256: 175405031e68b3407df29660b337a05fe6cea0025b6aeb9d40fd4d37a77808c6

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