Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1900e9a810d9aef…

MALICIOUS

PDF

76.2 KB Created: 2021-03-18 15:15:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4ecbbb945e651121dda1c8d73089be3 SHA-1: 9c9b0b4d363f8163ce7c1ba4e780ffdc7becb96e SHA-256: c1900e9a810d9aefc2a497b72a8a9136167921cc46cf13a38e6ac035ba3d683a
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, with one prominent URL leading to a domain associated with malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'data flow diagram symbols meanings', which is likely a pretext to direct the user to the malicious site.

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://xezojetit.ru/strik?utm_term=data+flow+diagram+symbols+meanings
    • http://majovevalaji.sportsontheweb.net/firujujozivikegowedanaviw.pdf
    • http://trikotoria.ru/anker_cb310_wireless_keyboard_and_mouse5224e.pdf
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fdbb735e750a.pdf
    • http://rotiwopofeze.mywebcommunity.org/luther_95_theses.pdf
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff26f6b5657c.pdf
    • http://nekretnine.site/246606220748a2uf.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_6021a320eb581.pdf
    • https://cdn-cms.f-static.net/uploads/4483338/normal_5fe83541b274b.pdf
    • https://cdn-cms.f-static.net/uploads/4490369/normal_602fc65069719.pdf
    • http://funomixukipiv.iblogger.org/laboratory_design_guidelines.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xafojoluti.epizy.com/80884405575.pdf
    • http://nedizilunok.myartsonline.com/warapejojig.pdf
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_a792f8917f5a4d19a660578ba0128ca1.pdf?index=true
    • http://tesoduv.rf.gd/define_leadership_army_study_guide.pdf
    • http://begosene.epizy.com/men_s_fashion_guide_2019.pdf
    • http://tugojan.rf.gd/zosezukol.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_5f18febc81574136b101a6d548df4273.pdf?index=true
    • http://fawikinego.myartsonline.com/tabla_de_ejercicios_abdominales_hipopresivos.pdf
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_fb2f449a07814c7fa201fe5b70cf288d.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_off0000ebbf.bin
3db54a14cd9537c413ed99b79205dd5968563a76a48d20972e97b940481db61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 5560 bytes
font_01_sfnt_off0000feb6.bin
8f56988bf0f7aac6b51b67d45bf69189cdacaa935b601d2e7638c620a40aba62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10680 bytes

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