Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d3936b88340aba…

MALICIOUS

PDF

79.0 KB Created: 2021-02-27 10:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0d3776baeea776a3dfd1b6208bffd0e SHA-1: 44773e940d2d48b414890b292982086b6ae0fd8f SHA-256: c1d3936b88340aba8586036600fe120c5b3ae50d905274d66a199a6350365e5f
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 domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://mezovuduw.ru/wix?keyword=yosuke+persona+4+social+link PDF link annotation
    • http://loxapul.iblogger.org/sovowuguzavudatuxaj.pdfIn PDF document text
    • http://sexedate69.site/jabikidelivubinidesuk6xjlv.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/gjftwii/ximefobadatewime.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/hfgdjgS/xemoki.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzesowasu/cW0TiXs/leatherface_1974_mask.pdfIn PDF document text
    • http://bestrongbyg.com/32382355112jd34l.pdfIn PDF document text
    • http://antinomi.design/geological_map_south_africa0jt9j.pdfIn PDF document text
    • http://vzale.ru/kuzidusotimobubojabikennm7w.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/hhghrSl/16535479681.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/ca_corporate_nol_carryback_form.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/kemogibemenilekejimiwava.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/hd9hcja/fogisawefatakegonew.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/ahbhd1h/new_york_crust_vs_classic_hand_tossed_dominos.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/ckjeibo/moneygram_inside_cvs_near_me.pdfIn PDF document text
    • http://hayatevesigar.online/bass_tracker_parts_for_saleha7c3.pdfIn PDF document text
    • http://fogarapisow.22web.org/viah_punjabi_song_pagalworld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuberifanarov.rf.gd/3.5_dd_monster_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 5040 bytes
SHA-256: 53c80233c391f5b3aa4ad41b30dfd8f341566ff11f1a636a018034a88187b76b
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 12824 bytes
SHA-256: 8fd246444aca7aed8504b28b3d24e605c040717516f4e26c60514096a09042c1
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16240 bytes
SHA-256: 1cbb36bb7b1d233ee9f5c2cce214d5b3269f5c1575f9f3c623519b72eb7db796

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