Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac2f14588e21932…

MALICIOUS

PDF

104.7 KB Created: 2021-02-26 05:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dfb311822ebb029446368b4931afffcc SHA-1: a63897f551ddb5f325899d757673495a5de23c2c SHA-256: 3ac2f14588e21932803a7bd1151ba56fd80bb96b14f04fb8f4b2d2ca244ce045
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of external URIs and link farm characteristics indicates a deliberate effort to obscure the final destination and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=employment+policy+in+india+wikipedia PDF link annotation
    • https://vuxupiwiruxip.weebly.com/uploads/1/3/0/9/130969000/9915336.pdfIn PDF document text
    • http://tamakar.tech/sebejujikuzut5doe5.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/6291238.pdfIn PDF document text
    • https://zamikife.weebly.com/uploads/1/3/1/6/131606416/xasoju.pdfIn PDF document text
    • http://ovca.space/foposesa0vrbx.pdfIn PDF document text
    • http://lnstagram-helping.live/how_to_find_nash_equilibrium_3x3xuwpc.pdfIn PDF document text
    • https://bogilerilixami.weebly.com/uploads/1/3/5/3/135345361/bopivugopizesola.pdfIn PDF document text
    • https://pepibugogik.weebly.com/uploads/1/3/1/0/131069762/xisozatur.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/nemafu/army_games_for_android_offline.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/83881432147.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/aminoven_15_fachinformation.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/12911478569.pdfIn PDF document text
    • http://setavafajo.epizy.com/xolozaxonenilima.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/ion_audio_air_lp_bluetooth_turntable_with_usb_conversion.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_off000159b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B8 5160 bytes
SHA-256: 2634fe6046349d8e3b0d5fe6a70fb79418143839763198a3e132ba022db6d14f
font_01_sfnt_off00016b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B56 12156 bytes
SHA-256: c865172847350aeb4449f2edd54f5c5c4fc89c4fbbc67d36c27257e06250efc2

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