Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7e34d6a15aae49…

MALICIOUS

PDF

79.7 KB Created: 2021-02-27 06:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a08af3492cf3215755f242b6ce6da6bb SHA-1: ee60be66a6eb3d1e5b5b9340e5ac2c0850593776 SHA-256: 3c7e34d6a15aae4910750c79157f649dad2e105dc0d59ad7c7d10fb19bd196df
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically crafted to appear as a search result for printer issues, likely to trick users into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan delivery mechanism. The presence of numerous links to disposable domains suggests a link farm designed to obscure the ultimate destination or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=hp+photosmart+plus+b209a-m+not+printing+color PDF link annotation
    • http://fastdonwload.space/anime_lock_screen_hd11gtg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_60034f9bc488b.pdfIn PDF document text
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/digojiwenuni_dujozani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_602217029e137.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/best_books_to_learn_about_american_politics.pdfIn PDF document text
    • http://timelessdecorum.com/alp_revised_answer_key69ywd.pdfIn PDF document text
    • http://lovelid.xyz/nikon_p223_3x32shsjh.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/whats_the_best_dog_training_shock_collargpjln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vedaremix.epizy.com/bruhn_structures.pdfIn PDF document text
    • http://lenobarokolubik.epizy.com/sanigopigezibogaluda.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/pukas.pdfIn PDF document text
    • http://watekiz.rf.gd/how_do_i_edit_text_in_paint_3d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 5912 bytes
SHA-256: d90596d0908f541787631acf1a73fab28887bd1d75c7f8e03dfe95db090c129c
font_01_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 10568 bytes
SHA-256: b143613d0e2f90229d8f0b93ddbfd2971bfea860416a32470eb9012494a7f792
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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