Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da7cd78d2c7f39c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 11:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86d4a6a5702c1bd2b00b1ce2e6e31f6f SHA-1: 7eee97a8da43787af0a1436b37f65835be5c76f8 SHA-256: 7da7cd78d2c7f39c8d7052fdaa559202e17e7e2cd1450ad9cdbb8b2719b32f85
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The document body, though heavily corrupted, contains keywords related to 'Farkle score sheet pdf free', indicating a lure to disguise the malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=farkle+score+sheet+pdf+free
    • http://koprovk.xyz/lg_smart_tv_guide_no_information8n1eg.pdf
    • http://furniture21.online/filutepevemeguj18wb.pdf
    • http://jefafagigovaga.iblogger.org/jotafivolojenilex.pdf
    • https://cdn.sqhk.co/famuxina/ujbwjiq/gunimutulijolexenov.pdf
    • http://nizavevorupuj.mywebcommunity.org/where_is_the_manual_eject_screw_on_ps4_pro.pdf
    • https://cdn.sqhk.co/nazopekujavi/bhjcgc7/wavazumapoxuja.pdf
    • https://bupimapigi.weebly.com/uploads/1/3/1/3/131383283/4584d8e5f08112.pdf
    • https://static.s123-cdn-static.com/uploads/4452377/normal_5fe5158a09761.pdf
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fe69b594b45a.pdf
    • http://rating-bookmaker.ru/xuseninipizuxio5b9e.pdf
    • https://cdn.sqhk.co/bujasugawo/hjjhiEZ/47535765431.pdf
    • http://br1.red/emulateur_android_ds_gratuitin6ty.pdf
    • https://cdn-cms.f-static.net/uploads/4416318/normal_602f89b887b99.pdf
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/dunovegopitarojereta.pdf
    • https://cdn.sqhk.co/logubaxe/vpmTVgj/23547646680.pdf
    • http://pemizirevubel.mywebcommunity.org/jibevuvegobobojazet.pdf
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fd67dd1bde45.pdf
    • https://cdn.sqhk.co/rasufizo/Mgfhcge/fm_frequentie_radio_2_den_haag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuxusar.epizy.com/hoover_carpet_cleaner_how_to_use.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_off0000ecd5.bin
135018a07e849db5f3d9cce35e73982f9b72e6deccc54793cbc69b83ee8d6c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 5264 bytes
font_01_sfnt_off0000febb.bin
a40dbdd92fd0c699550138e9c8df550bbb981f9b340b783e1ae77f0f4b36893e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 11200 bytes

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