Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d02d38e227dc7c…

MALICIOUS

PDF

80.5 KB Created: 2021-03-28 01:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6704f6e69d16b9749df5afe3fc818d70 SHA-1: ef5c951c110877677cc684893f4489aedfbf2ea8 SHA-256: 55d02d38e227dc7cecc184735cd6af54883cf3303bf3d803abdee6349e64125b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score support the classification as malicious.

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://zajinet.ru/award?keyword=windows+system+administrator+l2+interview+questions+answers+pdf PDF link annotation
    • https://posilukununafux.weebly.com/uploads/1/3/4/4/134498017/8530f1b.pdfIn PDF document text
    • http://juzezudusota.mypressonline.com/vifibigugumogopi.pdfIn PDF document text
    • http://importants.space/vanesalakoladujqaqm6.pdfIn PDF document text
    • http://zeropium.com/prayer_outline_imagesk28uj.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/electrode_potential_of_metals.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/Chjgiig/army_pt_uniform_regulation_2020.pdfIn PDF document text
    • http://mandarins.space/ashwini_ye_na_edm_mixtm07q.pdfIn PDF document text
    • https://tabowemonikose.weebly.com/uploads/1/3/5/9/135957185/1746956.pdfIn PDF document text
    • http://zhigina.ru/house_of_fun_free_coins_generatorahb6h.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/ickKDgf/fosolamipezenu.pdfIn PDF document text
    • http://gedawirij.66ghz.com/13821237950.pdfIn PDF document text
    • http://bilet-pdd.site/51760940538aseh8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/12715997155.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/nigalu.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/a4_drawing_grid_template.pdfIn PDF document text
    • http://tewederukafolez.rf.gd/46667277270.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_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 5712 bytes
SHA-256: b1bdaa5ae60018ea70c24b7e977d4eca39313d50b877fa02041a271a35a28732
font_01_sfnt_off0001113c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113C 10668 bytes
SHA-256: aec46c07cc148598d4e5b5e469dac71eea817293269192e185413574f3a21439

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