Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1834cb26e617df…

MALICIOUS

PDF

72.8 KB Created: 2021-03-23 12:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 821d29e1e7d471916c6adce6e479836c SHA-1: 381c90d9f4af305002dfef6649c6ab174337465a SHA-256: 3d1834cb26e617df52359ccbf3733ba702c719e8e4f5edfba80dd83ba0bc050b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of external URIs and a link farm suggests the document is designed to redirect users to malicious websites, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a police department, indicating a social engineering lure.

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://gimoguvi.ru/wix?keyword=brodnax+va+police+department PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385026/normal_5ff0cd6aa405e.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/AjiOjea/barbie_cooking_burger_shop_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_5fd623a93524e.pdfIn PDF document text
    • http://sreda.city/what_to_the_slave_is_the_4th_of_july_quotesptiqe.pdfIn PDF document text
    • http://roxopazin.iblogger.org/75840274773.pdfIn PDF document text
    • http://suxawid.iblogger.org/autocad_hide_border.pdfIn PDF document text
    • http://naturebiolog.fun/cloudflare_workers_unbound1g0ya.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394066/normal_5ffcefb7502af.pdfIn PDF document text
    • http://item-mask.top/meforimolodosejijokebk39k.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/cpPgdge/daily_deals_muskegon_hours.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zerakunutage.epizy.com/15025241806.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/design_book_cover_online_free.pdfIn PDF document text
    • http://tojikesopi.rf.gd/android_studio_first_app_kotlin.pdfIn PDF document text
    • http://tofolusobovuv.epizy.com/gastroenteritis_aguda_tratamiento_antibiotico.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/pathala_bhairavi_tamil_movie.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 5004 bytes
SHA-256: 01601b0638e6239933a4b66041bbb4bd3b11059c88a0eb9df68047377a7ce609
font_01_sfnt_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 11860 bytes
SHA-256: 6eac2354373e2bf76a0aebc1f59572df2d6a009c316f3a16819ca54301aef006
font_02_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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