Malicious PDF — malware analysis report

Static analysis result for SHA-256 425be1942e3e0465…

MALICIOUS

PDF

75.3 KB Created: 2021-03-14 08:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a33b826447abf1282edf17cdc42b3a9 SHA-1: f547f260a06b523be6addecc71269f42ea76e98e SHA-256: 425be1942e3e0465231ccc39f9ac2ee072604d849a83189849bbba6f0ecbd6dd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including one pointing to 'seumenha.ru', suggesting an attempt to drive traffic to potentially malicious or ad-heavy websites. The document body, though partially corrupted, indicates a lure related to 'how to draw an anime nose'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=how+to+draw+a+anime+nose PDF link annotation
    • https://cdn.sqhk.co/jurugaguvedu/ijgfPAk/59478350547.pdfIn PDF document text
    • https://gizomedapirev.weebly.com/uploads/1/3/1/4/131454265/repasop-pewet-rubemamoliv.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/how_many_books_in_the_shade_of_vampire_series.pdfIn PDF document text
    • https://falijufik.weebly.com/uploads/1/3/5/3/135349852/4459673.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/34150923098.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/ibUihia/wood_turning_simulator.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/vuxuwuvom_vodepapotanim_momiw.pdfIn PDF document text
    • https://rimejosokodux.weebly.com/uploads/1/3/4/6/134691074/9215d25a2.pdfIn PDF document text
    • http://nafewid.sportsontheweb.net/tableau_certification_in_bangalore.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/55888557083.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/protestant_amharic_bible.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/mghWTZo/vefabavewipidubikogazed.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/hfthaLs/jimidup.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzededoz/haCiiha/cruise_critic_roll_call_sky_princess.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/bgjNKii/33709435568.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/52353318615.pdfIn PDF document text
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/fomolidu.pdfIn PDF document text
    • http://www.dundeeentertainment.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxufazekez.atwebpages.com/misbehaving_the_making_of_behavioural_economics_richard_thaler.pdfIn PDF document text
    • http://nebojemesiwi.atwebpages.com/jilamutuwegunuvabo.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/how_to_unlock_i-pilot_remote.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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 4992 bytes
SHA-256: 48329648a57292df0ce7000ed390ebd1e41784d5e909410a3acf63822dce145a
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10284 bytes
SHA-256: 6b8fd3c7a1aa649a4c0ac0aecd5492070e3c842cf5f50a9a02c7774dadfffa96

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