Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a59421558cd92f…

MALICIOUS

PDF

69.0 KB Created: 2021-05-19 23:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a1e5df8a198467200e6e943dfe8ff3c SHA-1: a22d2f0d776dbdc54abc5e4195c43cea40e00427 SHA-256: 78a59421558cd92f1dbe856e752cd88ecdcfd231f3394511f811b4057b343393
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://resalured.ru/strik?utm_term=avidyne+ifd+440+user+manual
    • https://cdn-cms.f-static.net/uploads/4367273/normal_60214150bfc28.pdf
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/levowebokulamag-mawipewoweteme.pdf
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/bc8349314b052.pdf
    • https://madigapelodawip.weebly.com/uploads/1/3/4/8/134846312/tofobo.pdf
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/bugiwakapiporunafa.pdf
    • https://cdn-cms.f-static.net/uploads/4530846/normal_603895bfb8e62.pdf
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fc60a2e3298e.pdf
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/pabizem-zodadomaravit-numudave-zalubofufozigo.pdf
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/jogoviwitupataf-kulufaxoxolif.pdf
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/kugewekudirez_zedevab_pexabewitexa_fiwefezavuzeb.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/rijowaxisarupivurume.pdf
    • https://wubaruduxosekur.weebly.com/uploads/1/3/4/4/134484821/b981c9f.pdf
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/xiligazuditekeze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8dd1ddbe-d99a-4917-8e2f-161faf2a0d2d/moxejigedumaribev.pdf
    • https://s3.amazonaws.com/veraxawewib/wajujaraler.pdf
    • https://s3.amazonaws.com/nefomojuwet/bapanojefuxeripudolewip.pdf
    • https://uploads.strikinglycdn.com/files/a5fed9ae-52ed-423a-833f-3782695cf11e/what_modems_are_compatible_with_optimum_voice.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/sonic_oreo_blast_sizes.pdf
    • https://uploads.strikinglycdn.com/files/5822baf3-d7c3-4d5f-97a9-01d017ce9786/sumuta.pdf
    • https://s3.amazonaws.com/gotijejaj/nomitizofebuvip.pdf
    • https://uploads.strikinglycdn.com/files/be9c7bf3-ba86-4cb4-8759-ca2ddd346c73/is_dr_berg_legit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd7.bin
f8220ed97ce8ed93589850e4760587c8aa85fec41365fdf278a0a63447f4ae83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 5432 bytes
font_01_sfnt_off0000e24d.bin
1e157cbc03efdb6233caf1d8075585a1a3eb8ce7aed843529ae19340e49e02ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 10848 bytes

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