Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8bf45d0a06aa37…

MALICIOUS

PDF

71.7 KB Created: 2021-02-28 16:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b9b3e86475fb67a8ef7bdea43686a5b8 SHA-1: d65ce0b8a94ab514aadb19b14ab02066ffb88395 SHA-256: 5a8bf45d0a06aa37af93c88ce14569dacc073c4ccb3a38595e12a8247c71fe9d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to this tactic. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it is used for phishing or malware distribution.

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://botokaw.ru/wix?keyword=jessica+norris+pole+dancer PDF link annotation
    • https://cdn.sqhk.co/jirudumom/8ifgcjc/farmville_2_country_escape_cheats_for_android.pdfIn PDF document text
    • http://damvglaz0.xyz/13708361149kcnxt.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/niwumesi.pdfIn PDF document text
    • http://idealica-official-it.website/solupukifamawapapanepkzswo.pdfIn PDF document text
    • http://salopkisa.website/avillion_berhad_annual_report61b5v.pdfIn PDF document text
    • http://it50disconto.pro/heartworm_treatment_guidelines_dogsk0jtt.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/dnhj0hC/w3schools_css_position.pdfIn PDF document text
    • http://littlenat.space/856475639923g4zi.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/VWijjfV/93711476230.pdfIn PDF document text
    • http://ca-management.website/hubert_rochebois_armagnacqkoag.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/unir_varios_en_uno_foxitogbem.pdfIn PDF document text
    • http://4escam-bot.online/fnaf_the_silver_eyes_audiobooktyoei.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/67080602720.pdfIn PDF document text
    • http://wawepeb.22web.org/lovog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvituze.epizy.com/37989532027.pdfIn PDF document text
    • http://totiwofosu.epizy.com/vapewuzojepivi.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/avital_5303l_security_remote_start_system.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 5056 bytes
SHA-256: 7c582d1749a50409288df3494110a1925d5d7f81c72333daa8ebac90866c0246
font_01_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 9900 bytes
SHA-256: 515174fe474a98a6d605c9626db22410123cf403b5441b47bc5892662973de74

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