Malicious PDF — malware analysis report

Static analysis result for SHA-256 952d04eae3056729…

MALICIOUS

PDF

73.7 KB Created: 2021-06-02 10:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f13b215fce866bd73f129f379e560528 SHA-1: 77c21600eedb067bece3b61df468d94a144680b6 SHA-256: 952d04eae305672957c4bc62d300c71d732d8086092738d583e95d8f7b32dcda
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to installation instructions and application names, suggesting a lure. The presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/pbw?utm_term=how+to+install+os+10.11.4+on+mac
    • https://detatabuloto.weebly.com/uploads/1/3/5/3/135346227/a45256fd7.pdf
    • https://cdn-cms.f-static.net/uploads/4443342/normal_60540cdb41f9f.pdf
    • https://cdn-cms.f-static.net/uploads/4482870/normal_60343aa1d20e3.pdf
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6009b88c1cc99.pdf
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/tumelexokevi_vokoraxam_wokukugowewo_rafoki.pdf
    • https://static.s123-cdn-static.com/uploads/4365584/normal_5fee33cb9c093.pdf
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5fdecb31af6a1.pdf
    • https://cdn-cms.f-static.net/uploads/4387933/normal_605f9f989c59f.pdf
    • https://cdn-cms.f-static.net/uploads/4444874/normal_606731aa66502.pdf
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/2909773.pdf
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5fde3d2079ba2.pdf
    • https://jofukesor.weebly.com/uploads/1/3/3/9/133999831/2596090.pdf
    • https://cdn-cms.f-static.net/uploads/4453326/normal_604219aa13659.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd84f6f1c27a.pdf
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd5f7f34afc4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144424077/guia_super_mario_bros_nintendo_ds.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144411690/zefaseratujerituxidivu.pdf
    • http://tusoxefum.pbworks.com/f/banumabalexejas.pdf
    • http://mujusevo.pbworks.com/f/what_types_of_intermolecular_forces_are_expected_between_so2cl2_molecules.pdf
    • http://gatasulupu.pbworks.com/w/file/fetch/144425886/sigma_bc_1609_sts_cadence_manual.pdf
    • http://kapetipubi.pbworks.com/w/file/fetch/144426105/allied_universal_ehub_training.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144424500/bible_reading_study_guide.pdf
    • http://supatibu.pbworks.com/w/file/fetch/144428448/kibepixawimomepopaba.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_off0000e22a.bin
1964aecc94b2161e080e9b2f0ed17a6d6cdcec96b0abc493d73b444cabe7da51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 5216 bytes
font_01_sfnt_off0000f3f3.bin
a0744c4e6799584d9e7369f17ff09e49045d04f910eafadfd5d66cf24bf82f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 11012 bytes

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