Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b03920f8fecf7f…

MALICIOUS

PDF

73.8 KB Created: 2021-03-31 04:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c560ec5a763bd747d1d40fa5eaf3ab9 SHA-1: cad878883a381f1a43b7fb9d8cc5b541fe9e7d2d SHA-256: 92b03920f8fecf7fabea31ac015bbb493284a3765c75f3f44ef630fb55b4c752
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 variant. It contains an embedded URL pointing to 'seumenha.ru', which is likely the primary distribution point or phishing site. The document body, though partially corrupted, suggests a lure related to 'free seasons worksheets for preschool'. No scripts were extracted, but the PDF structure and URL are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=free+seasons+worksheets+for+preschool PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471273/normal_5febe04700b87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5ff32d3f3ee0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_604e1485c1d15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530323/normal_5fd86d91ddeeb.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/WPbghoZ/xawegimegegunafetenivemod.pdfIn PDF document text
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/1e22e234f9bc60f.pdfIn PDF document text
    • https://ruwawakutiro.weebly.com/uploads/1/3/0/8/130874672/4955132.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/e64659be1364.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/ELyYgfT/196215888.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6008b1fbbc1f6.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/saguv.pdfIn PDF document text
    • https://cdn.sqhk.co/tumupowe/jbYihhi/top_tree_dawnblade_movement.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/xhtsjhW/chocolate_cake_decorated_with_macarons.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/atmega2560_pinout.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/blowflies_diptera_calliphoridae_of_fennoscandia_and_denmark.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/agricultural_science_textbook_grade_11.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/6542058.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/debiwelof/glacier_bay_faucet_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/18316722542.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/zutew.pdfIn PDF document text
    • http://sukokovevaz.atwebpages.com/used_vermont_castings_encore_for_sale.pdfIn PDF document text
    • http://vowefaxi.epizy.com/69275039810.pdfIn PDF document text
    • http://rixupod.rf.gd/agnathavasi_telugu_movie_tamilrockers.pdfIn PDF document text
    • http://redotikami.rf.gd/vutezotadev.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_off0000e4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E3 5216 bytes
SHA-256: 1376cbcb68a32f56b249eb79c4a2665ee7cf00ba3a6fec74f53e255b888c8f64
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 10196 bytes
SHA-256: b2ffedbbbf9e68a3d7251684231b81632f2f67113cb9bd381027e2db868720d3

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