Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a500243ab4f0569…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 05:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c52e9e682c1a30a5591ce2983e6df92 SHA-1: 3b12a4e8ed2bd9e4d36489b6535d3d4c36042cf3 SHA-256: 9a500243ab4f05690ae41ced1d1641c2d3b3aa1776af952c3d488902da3e8a92
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 numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=oracle+sql+concatenate+3+values
    • http://rasprodavaika.ru/35484911010tkfdh.pdf
    • http://oneitstore.pro/butterflies_are_free_full_moviebcler.pdf
    • http://tosety.xyz/dofulesazekalowobuyecy7.pdf
    • https://cdn.sqhk.co/reparepoki/cMhjJmg/fleet_commander_red_hat.pdf
    • https://cdn.sqhk.co/ladesajisama/dhehanv/fax_transmittal_sheet.pdf
    • http://bigswinner.space/xuneduvusozklh13.pdf
    • http://servisvds.ru/vaguje5iocb.pdf
    • http://questotzvezd.space/798992803504ksdj.pdf
    • http://banki-internetowe.com/128035030493gk77.pdf
    • https://cdn.sqhk.co/bamopilu/Qjh9EeM/49999158146.pdf
    • http://basvuruizleme.online/zarupawuwosqtxr.pdf
    • http://arendaavto.taxi/tusafukafop0l1ud.pdf
    • http://community-day.ru/ponejowuxen0mcl.pdf
    • http://meetsol.xyz/dds_discount_near_me_applicationobqu8.pdf
    • http://auth02mobility.com/9188358700q17fg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9a4c684e-3c63-47da-ac61-6d66b0a06381/sezitezulafituxonak.pdf
    • https://uploads.strikinglycdn.com/files/72bb0d88-ea9c-477b-b234-5a2a012cf774/how_do_i_keep_him_interested_after_sleeping_with_him.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_off0000fa54.bin
5d1220394fd67984e14456e3cd136aaf6c2535393898f77d3f303c6991789abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 5172 bytes
font_01_sfnt_off00010bff.bin
f563c4f688d41f4db41ecdcf165402a9b5c9ecc643277d79188b3e586acf2b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 11500 bytes

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