Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe1cade738f8d21…

MALICIOUS

PDF

82.9 KB Created: 2021-04-22 00:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba319c82bdf4df36a841348021634ff9 SHA-1: 1ed91b1e57ccb41888ceecfc5fa9c7908a090614 SHA-256: dfe1cade738f8d21717fb6911bdb751a77deee3507a36cddda671c2a4b1e8196
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external URIs and the overall structure suggest the PDF is intended to redirect users to potentially malicious websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=archfey+warlock+spell+list
    • http://on24-system.club/airthereal_ma10k-_pro_user_manualzeslk.pdf
    • https://static.s123-cdn-static.com/uploads/4478141/normal_6005206763717.pdf
    • https://cdn-cms.f-static.net/uploads/4377388/normal_606064da34f0d.pdf
    • https://cdn-cms.f-static.net/uploads/4466408/normal_60199e6e8a3f6.pdf
    • http://my-favshopd.online/swedish_flag_emoji_androide6okb.pdf
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fcd04026166c.pdf
    • http://xuzazijup.22web.org/nukuxobobabotovuxikugev.pdf
    • http://storeplus.pro/mathematics_for_economics_hoy_free_downloadsggra.pdf
    • https://cdn.sqhk.co/tasokuxu/hhahfgg/get_free_stuff_online_no_surveys.pdf
    • https://cdn-cms.f-static.net/uploads/4377909/normal_606e47289a745.pdf
    • https://cdn.sqhk.co/perigupa/bhfhjpm/chennai_super_kings_ipl_match_2019.pdf
    • https://cdn.sqhk.co/reposivekow/Qjbheic/32772297606.pdf
    • https://cdn.sqhk.co/veladaxuzeba/hakjhpV/59379757906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jexoxitisujoj.rf.gd/mumusonozoburikokof.pdf
    • https://s3.amazonaws.com/nowokil/26446712416.pdf
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_d692b27b93fe41d19fb209891fbdf009.pdf?index=true
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_b94261ccb148449d9d0d7e110a33ff24.pdf?index=true
    • https://s3.amazonaws.com/tikoweravisixu/15877502881.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_2d0f97a4b70a467d80e12d03b6341450.pdf?index=true
    • https://s3.amazonaws.com/bulolimepol/what_color_absorbs_more_light.pdf
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_c1252fbc4bc2473ea7126da16fa01803.pdf?index=true
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_ab766b9ff52946a0bb8e3a30554aaa59.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_off00010889.bin
46757d9fdea6fb2847ec44b9710a9b4e1c8160b0bb4d711e0b07e0a07303b0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 5348 bytes
font_01_sfnt_off00011ad5.bin
7e279ddbce863bf8d6d4d9b14edbe2c286d2c173030a873bc2f55ab1192d318c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 10236 bytes

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