Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4af35ef09b309ec…

MALICIOUS

PDF

74.2 KB Created: 2021-05-17 09:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0bdee5fdcd257c12368f0e2a6f16cf5 SHA-1: f7205eb2b4c237d03fdccbdd7ce0566931ef11c8 SHA-256: b4af35ef09b309ec8838fd236eef52a7ce4a82cb562e0801f693a6c9eab23087
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, contains references to 'Hp 7520 printer ink' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure. The presence of numerous external URLs, many on disposable hosting and using UTM parameters, strongly indicates a phishing or malicious redirection attempt.

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/strik?utm_term=hp+7520+printer+ink
    • http://saveyoutubebot.com/46458492725ea4w7.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://mujubow.getenjoyment.net/rezodubidewedegarezi.pdf
    • http://kimiter.medianewsonline.com/13474635628.pdf
    • http://pakawuwujawo.getenjoyment.net/arte_bizantino_arquitectura.pdf
    • http://siviveko.getenjoyment.net/ashrae_handbook_fundamentals_2013.pdf
    • http://danoguvu.medianewsonline.com/subject_verb_agreement_rules_and_examples.pdf
    • http://fakexexu.sportsontheweb.net/sefelag.pdf
    • http://tojuvapemupo.mywebcommunity.org/relationship_between_anxiety_and_depression.pdf
    • http://nopotaz.medianewsonline.com/assurance_and_insurance.pdf
    • http://vobalemujumojak.mywebcommunity.org/how_to_connect_rock_band_4_guitar_to_xbox_one.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pipaneku/pablo_neruda_poemas_de_amistad_cortos.pdf
    • https://s3.amazonaws.com/divikufifir/teteg.pdf
    • http://zubixuguse.epizy.com/ipcc_climate_change_report_sea_level_rise.pdf
    • http://lufiwivumijej.myartsonline.com/52069730018.pdf
    • http://fimamuvumurepu.rf.gd/joint_venture_agreement_south_africa.pdf
    • https://s3.amazonaws.com/sirilagewuga/tatufadukuriwapixuluxe.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_off0000e526.bin
4a566067740dd2de4c28b528bafd7b2d3a74e071fd28494b91acbb3f3f52351e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 4896 bytes
font_01_sfnt_off0000f5f8.bin
fa43ac7f388083351bb521b93b942e0c4f1c8a8a09eb021b72f8a5ca2c5771ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 11184 bytes

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