Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03aca4807605a21…

MALICIOUS

PDF

76.5 KB Created: 2021-02-22 22:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f274a15b011490b83eb9a31bea19fbc1 SHA-1: b53fdf628aac06d9d3d4d8012e8db64cd2870814 SHA-256: b03aca4807605a216c4fabd2829e34a07e06d6f488090fb170137d8284ed959a
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains ('bologen.ru' and 'kudopifupelixi.22web.org'). The PDF structure and embedded links suggest an attempt to direct users to external sites, likely for credential harvesting or further malware delivery, aligning with spearphishing tactics.

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://bologen.ru/123?utm_term=spqr+a+history+of+ancient+rome+by+mary+beard+%25282015%2529 PDF link annotation
    • http://kudopifupelixi.22web.org/tuzojazepabopaven.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_600e79d9a9c68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_6003aced5f3ef.pdfIn PDF document text
    • http://reawont.online/josuruxazajufuxof10c.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/combined_operations_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_6029abb2d1640.pdfIn PDF document text
    • http://axecheat6.xyz/tajupavawudobul3gjxu.pdfIn PDF document text
    • http://carinsusa.com/steps_in_root_canal_treatment9ryj1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sabukizazuse.epizy.com/cecchetti_ballet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/863486230.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/oxford_dictionary_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/xorubamajemo.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/guidebook_gallery_windows_xp.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/xitamagizopezileza.pdfIn PDF document text
    • http://lubunazunenixo.rf.gd/quarta_bucolica.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 6440 bytes
SHA-256: fdf7e1320555be20bc911de4a5a84adee518afde37add1588d0cfc7b4f7f1d4a
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 12272 bytes
SHA-256: 9662e6c79825e8be61d7995988b30bcac76ee149c22fb5e2b3727ca20a3ce86e

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