Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1f867fe588cb70…

MALICIOUS

PDF

82.2 KB Created: 2021-04-29 14:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dd8c4c7aceb72a96b20618fa3c548c1 SHA-1: 7371bdd9059d4290ffba6095c675e8bb304ae95e SHA-256: 0b1f867fe588cb709b8daf1f788746cba854b7413d3290b7e81bd7ce0e6409a9
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 trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://botokaw.ru/strik?utm_term=garmin+etrex+10+accuracy
    • http://rafupofamurawaf.mygamesonline.org/68120661734.pdf
    • http://tuzotumefakorok.scienceontheweb.net/68438151305.pdf
    • https://cdn.sqhk.co/lomasamube/fPfjgti/sniper_ultimate_assassin_2_hacked.pdf
    • https://cdn.sqhk.co/vufisolepu/sghiacf/gsmarena_samsung_s10.pdf
    • https://cdn.sqhk.co/muxigatatini/jeMq6hh/bimivuworibub.pdf
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5fcb5597a75f3.pdf
    • http://tegubija.mypressonline.com/quantitative_aptitude_shortcuts_for_bank_exams.pdf
    • https://cdn-cms.f-static.net/uploads/4417422/normal_603b805a3412a.pdf
    • https://static.s123-cdn-static.com/uploads/4476930/normal_60012b1a64840.pdf
    • http://kajuzumanaz.sportsontheweb.net/20178395475.pdf
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdf
    • https://cdn.sqhk.co/nebafaveju/ibgful4/alexander_pushkin_short_stories.pdf
    • https://cdn.sqhk.co/girewobo/WMl8v2H/tennis_champion_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4449793/normal_6068cfcb516c9.pdf
    • https://cdn-cms.f-static.net/uploads/4367283/normal_60256f2cc7dda.pdf
    • http://duwuzoruperiged.scienceontheweb.net/tlcharger_les_4_accords_toltques.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gajutar.onlinewebshop.net/rumafagiwigemalerasage.pdf
    • https://s3.amazonaws.com/gelawiweza/83635614652.pdf
    • https://s3.amazonaws.com/luxelula/99532435119.pdf
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_bb88f9c773994e40ae13166f4f7d6a8e.pdf?index=true
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_4160bbf8a9db49df8e1e880011ab4008.pdf?index=true
    • http://reladefuxuna.onlinewebshop.net/computational_complexity_a_modern_approach_download.pdf
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_6b997df8e6d1402da7bed785657754e9.pdf?index=true
    • https://s3.amazonaws.com/zumezeviwakiz/42293487079.pdf
    • http://lojubefogugiku.onlinewebshop.net/is_genie_2_worth_it.pdf
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_d379ea70963742c286374e8f28449948.pdf?index=true
    • https://e2a12503-e9f4-4898-9b1e-00959bf5a9c8.filesusr.com/ugd/1f0de7_78b4a6bf16e247c09e6088cae77a0e5d.pdf?index=true
    • 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_off000104ab.bin
e434696ac1a9f1dcefb774d763af096217ff1c300c67ebf5b662224fc1be4a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 5132 bytes
font_01_sfnt_off0001161d.bin
e465531afe1d64500d29b8f30722cf6afe10c5d70d72cebd65cc38cd8936fa5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 11072 bytes

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