Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcce27275ef2cff…

MALICIOUS

PDF

74.7 KB Created: 2021-03-15 08:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 400fa2b13a08151b2884a31abd1b7546 SHA-1: bac5d3c94643a7b730342c25e90bf6de9e89ef12 SHA-256: efcce27275ef2cff373a1ddbee76dc6039ec4409ec23fdcd12c22ee02d6bdafe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to redirect users to potentially harmful sites. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=honeywell+th9320wf5003+wifi+9000+manual
    • http://sakhavto.ru/ielts_bc_score_reportingjhb3l.pdf
    • http://ceter.xyz/barnett_jackal_4x32_crossbow_scopety7vq.pdf
    • https://static.s123-cdn-static.com/uploads/4504788/normal_5feeb6b85e919.pdf
    • https://cdn-cms.f-static.net/uploads/4443823/normal_602463c295556.pdf
    • http://in-arenas.com/barrons_gre_book_22nd_editionqzgs2.pdf
    • https://cdn.sqhk.co/rudugebakivo/ggf6Fig/48783808644.pdf
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5ff0e39b7ea0f.pdf
    • http://rm-swis-mine.com/badla_movie_song_pk15drz.pdf
    • https://cdn.sqhk.co/libegavezu/1NjuLlr/wbtv_weather_girl_kelly.pdf
    • http://povusafurezo.iblogger.org/bumogazurenusuluwumem.pdf
    • http://microdigitalmeter.xyz/how_to_use_adobe_premiere_for_beginners5uv88.pdf
    • http://istlan.space/sixuka8spm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mufogedone.epizy.com/kowurowug.pdf
    • http://nitobub.rf.gd/introductory_astronomy_and_astrophysics_4th_edition.pdf
    • http://fegedenem.rf.gd/65448954773.pdf
    • https://uploads.strikinglycdn.com/files/b19f39c8-adfb-493b-b6e9-07cb7fd76861/lejugapoju.pdf
    • https://uploads.strikinglycdn.com/files/c8051fce-ffdd-4ee9-b8f3-036534785948/36806567918.pdf
    • https://uploads.strikinglycdn.com/files/3ad531ad-ebee-438e-a074-18627c72e5cc/xikisosewuvududaxi.pdf
    • https://uploads.strikinglycdn.com/files/5551a6b8-869e-4dfb-acc4-1de3e13520fb/86976160607.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_off0000d5eb.bin
794b93c8ed5faa252901e7593cd99c8fb929b27f343d40c2a743bf246a33ad4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 5488 bytes
font_01_sfnt_off0000e881.bin
93ea0b0ab0478b410ae684ebef90361a35ab8bf027f5c1ee913f862d3e51832a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10916 bytes
font_02_sfnt_off00010db9.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 4324 bytes

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