Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfe649c077c42bf…

MALICIOUS

PDF

84.3 KB Created: 2021-03-14 03:35:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5f45c000606ced60d21f2afeb343f17 SHA-1: 100a23090deaec802a719e50f514b7ed88bdcd3d SHA-256: 2cfe649c077c42bfe9fac9174cd0ce324e8f2c39439d7b8c49b5934aabf8ca76
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack vector appears to be directing users to external sites via deceptive links disguised as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=how+to+make+timex+watch+stop+beeping
    • https://cdn.sqhk.co/negarevuzesi/kXjhXic/difubuf.pdf
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/5175146.pdf
    • https://gujavaluzosozu.weebly.com/uploads/1/3/4/0/134013303/vetiboguverebaruba.pdf
    • https://cdn.sqhk.co/fimegasaz/xs2khgC/latutorobojeledov.pdf
    • http://josumewemuzob.getenjoyment.net/klein_tools_ncvt-2p.pdf
    • https://cdn.sqhk.co/purorenutuw/ekpjahf/supercharger_kit_for_5._7_hemi.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5fd18d93dbd65.pdf
    • https://cdn-cms.f-static.net/uploads/4365540/normal_60250075e852d.pdf
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/617122.pdf
    • http://nomenowunesazoz.scienceontheweb.net/38185847835.pdf
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/2ff159aa55.pdf
    • https://bunazavej.weebly.com/uploads/1/3/5/3/135316535/2136613.pdf
    • http://lazokiwumemo.mygamesonline.org/20541821463.pdf
    • https://cdn-cms.f-static.net/uploads/4498678/normal_6041693c937e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jokotaziweluge/ost_ajari_aku_islam.pdf
    • https://uploads.strikinglycdn.com/files/46b14cc1-d286-46a4-8f27-7e02416af546/delta_table_saw_replacement_parts.pdf
    • https://s3.amazonaws.com/zunaporam/fokelixok.pdf
    • https://s3.amazonaws.com/wovedukevikov/ar_15_upper_receiver.pdf
    • https://s3.amazonaws.com/pusixa/zorepizuromedomu.pdf
    • https://s3.amazonaws.com/jefazaxal/mini_cooper_s_manual.pdf
    • https://uploads.strikinglycdn.com/files/1f8562c2-1adf-4271-ab6b-af035cd7e0f1/vaxafisazinajovadawoxax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfa.bin
7a2ce5ba4a7c06eae4123b76cd4c9141aaa1ebbde42993c452cffc9db38be02b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 5332 bytes
font_01_sfnt_off00011006.bin
b99630a4bb4838b20c0f8c4c19ccbeb1ed668a34548267994f97b7dd818caf7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 10992 bytes
font_02_sfnt_off000135b9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 4324 bytes

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