Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ee9e352175e836…

MALICIOUS

PDF

86.5 KB Created: 2021-03-18 09:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 504966afb1b72821af1627c88cd0db46 SHA-1: de6c4f034df3fede66c53d33d54cb1ab1bf40cd2 SHA-256: b6ee9e352175e8366d901c17808f9dc347b8c78bdfd1a61dcd98fe23216cb0db
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable domains, often used for phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=chicco+bravo+for+2+double+stroller+used
    • https://dukupifit.weebly.com/uploads/1/3/0/7/130775427/daseduzenur.pdf
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/lopugufosulut.pdf
    • https://zuvagojajom.weebly.com/uploads/1/3/5/3/135398962/e8a2f3a60d30ce1.pdf
    • https://vopumatibu.weebly.com/uploads/1/3/4/4/134402560/5c659be.pdf
    • https://cdn-cms.f-static.net/uploads/4444104/normal_600eb1266d78a.pdf
    • https://cdn.sqhk.co/kumotuxijufu/hgUgdij/idle_car_tycoon_mod_apk_1._19.pdf
    • http://nukisekafuleda.22web.org/assembler_compiler_and_interpreter.pdf
    • https://cdn-cms.f-static.net/uploads/4486534/normal_5fe888c8304b0.pdf
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/zifaxaxisekimalak.pdf
    • https://cdn-cms.f-static.net/uploads/4413225/normal_5fd2aeb522d0d.pdf
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/6417858.pdf
    • https://cdn.sqhk.co/wujakegu/d5hezhb/33898813434.pdf
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6040c2479930b.pdf
    • https://farunigi.weebly.com/uploads/1/3/4/7/134716297/4e6548e29e6.pdf
    • https://cdn-cms.f-static.net/uploads/4406464/normal_60452df42ae01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wozoxub/lijenow.pdf
    • http://jufazireti.rf.gd/ahir_image_hd.pdf
    • https://s3.amazonaws.com/kujapomib/dungeon_master_s_guide_5.pdf
    • http://tewufadab.epizy.com/kobalt_60_gallon_2_stage_air_compressor_reviews.pdf
    • http://pexagawilifun.rf.gd/mojupalopup.pdf
    • http://dalapodomunok.epizy.com/bangladesh_general_insurance_company_ltd_annual_report.pdf
    • https://s3.amazonaws.com/subopukomanaw/jokewugetuf.pdf
    • https://s3.amazonaws.com/padadutiseni/48305435644.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_off000112bf.bin
5f682d387665be0cba46e7b898fa327266b67d31bd4ae703b92b2cfddd3290c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 5348 bytes
font_01_sfnt_off000124e9.bin
199799ae0c226f98f8fd1e5d0d7ff9526dff5de1762bb2b06e0bf65365b6f13c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E9 11760 bytes

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