Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2acec35b501321…

MALICIOUS

PDF

98.0 KB Created: 2021-03-26 10:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3a92f3f1cecf03782bb31095363b7e SHA-1: e28624b42b6487cc261c502aedf7636d22951edc SHA-256: 6f2acec35b501321e6f28279272d8b1bc4b4557affa33c3fd1b480cc98308a08
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to PDF creation and potentially keywords for search engine optimization, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jumiwimov.ru/award?keyword=apertura+democratica+en+mexico+pdf
    • http://vaxiliwu.medianewsonline.com/tcnicas_de_redaccin_cuales_son.pdf
    • http://keepmaxi.space/what_is_news_article_all_aboutsyo32.pdf
    • http://useplafond.xyz/zejinisiforixilx5u33.pdf
    • https://cdn-cms.f-static.net/uploads/4403681/normal_60228b22e3339.pdf
    • https://static.s123-cdn-static.com/uploads/4454171/normal_5fdfd90526412.pdf
    • https://cdn-cms.f-static.net/uploads/4501028/normal_6017731c51ad9.pdf
    • https://cdn-cms.f-static.net/uploads/4459654/normal_6024ed5fb19bb.pdf
    • http://aazzzry.space/lusafasotukowuweziduwt5cs.pdf
    • http://idealslimitalia-oficial.site/xivolepixodarivorvmqcu.pdf
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff45fd1aea9e.pdf
    • https://cdn-cms.f-static.net/uploads/4489994/normal_5fd76bdd15658.pdf
    • http://rabota-plus.club/canine_adenovirusnvo1z.pdf
    • http://ludshop.xyz/sobovijafavuxezalib78k5v.pdf
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5ff78137c2d00.pdf
    • http://takipleskazan.org/537937874dorju.pdf
    • http://dupuladusudired.mypressonline.com/ancient_egypt_economy.pdf
    • http://krepezh.guru/apc_back-ups_pro_1000_wont_turn_on0e4zb.pdf
    • http://grizhoff.ru/8731195855pqnsj.pdf
    • https://static.s123-cdn-static.com/uploads/4469860/normal_5ff229543c996.pdf
    • https://static.s123-cdn-static.com/uploads/4493881/normal_5fdd37605ee52.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_604a3a933bcc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://muliwavanebebo.onlinewebshop.net/14778576261.pdf
    • https://uploads.strikinglycdn.com/files/0aa33dca-8b3f-4fd2-9163-3adf7c46f691/31076517959.pdf
    • https://uploads.strikinglycdn.com/files/1a238052-d90f-454d-9299-c298cbab95f3/rhetorical_question_in_a_sentence.pdf
    • https://uploads.strikinglycdn.com/files/195a64d7-d578-4cc6-9024-2e953d08b678/char-broil_commercial_tru-infrared_stainless_black_4-burner.pdf
    • http://jujobope.atwebpages.com/column_addition_and_subtraction_worksheets_year_4.pdf
    • https://uploads.strikinglycdn.com/files/9c737dd5-b323-4be8-a6ad-325bf5f26fbf/96271123753.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_off000140c2.bin
bd0303e82c70339fd6982b387498700bdda91f93af1a67e70b661649676aac08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 5148 bytes
font_01_sfnt_off00015238.bin
8771f642c326830d880479b3f11c02190fc8dc8190b63ce4a72c4f75534531b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15238 11752 bytes

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