Malicious PDF — malware analysis report

Static analysis result for SHA-256 c085cce0abf1ded4…

MALICIOUS

PDF

68.3 KB Created: 2021-03-11 19:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79ad7e61f819ecdcd7198ce598135562 SHA-1: 13a73cfd8b51dc65b71817b4e5a3f7a86da39bc8 SHA-256: c085cce0abf1ded4d12fb330074dc8392b8a1994e5ae8dd92c75ad498155cbf9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, a common tactic for distributing malware or phishing content. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

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://bologen.ru/wix?keyword=mitsubishi+lancer+manual+for+sale+nsw
    • http://siwivelijutore.medianewsonline.com/94113747892.pdf
    • http://gatofupimekow.mywebcommunity.org/dometic_brisk_air_2_heat_strip_installation.pdf
    • http://arfeshome.com/alkyd_resins_technology_handbook_free2ydbc.pdf
    • http://xemakaze.mywebcommunity.org/spoken_english_for_beginners_free_download.pdf
    • https://cdn.sqhk.co/joxomawezu/fdiczZ7/azamara_journey_refurbishment_2016.pdf
    • http://carluxepaint.site/expressions_with_get_worksheetyrpsj.pdf
    • https://cdn.sqhk.co/mudonisogub/z9ibjdE/momexuvifafajinunu.pdf
    • http://fuvesozufinefi.medianewsonline.com/download_film_fifty_shades_of_grey_2019_sub_indo.pdf
    • http://nafarami.medianewsonline.com/wahl_clipper_9818l_charger.pdf
    • http://vipadminler.org/70196852653poc8h.pdf
    • http://axacheat4.xyz/is_the_worx_trivac_cordlesscddkd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://siwodonodefofo.epizy.com/94341590809.pdf
    • http://zijodere.rf.gd/newidiweron.pdf
    • http://rosajeku.myartsonline.com/41083507166.pdf
    • https://s3.amazonaws.com/setikizo/flow_chart_template_powerpoint_2010.pdf
    • http://xojudemavu.onlinewebshop.net/macbeth_act_4_scene_2_literary_devices.pdf
    • https://s3.amazonaws.com/natewared/kalejumelazumebu.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_off0000ce97.bin
3db5d99bb9c10d2128ed86c23dba8b99e5cea724c4b613f7f7ab466ac22eaa19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 5360 bytes
font_01_sfnt_off0000e0c1.bin
6e20046c624316ce442047be0a5693b276385cb099c3b6357c5a28a58026e187		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 10424 bytes

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