Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d67644696d861…

MALICIOUS

PDF

77.5 KB Created: 2021-02-16 01:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 02d7bb60153573cc80ef5d0cd6cac48e SHA-1: 5af512089509e433ed89c520995fed6e9597837b SHA-256: e28d67644696d86194838e37ac16df2b05fa85c0c0e7eb5fe7ec86b2919f3924
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates potential execution of commands within the document context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://baarspo.ru/strik?utm_term=rinnai+tankless+hot+water+heater+code+11 PDF link annotation
    • https://sutogibigasoju.weebly.com/uploads/1/3/1/0/131070189/tunejeku.pdfIn PDF document text
    • https://cdn.sqhk.co/zipuzedozame/cjiNhb3/photo_collage_program_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_602af6d2cc7ae.pdfIn PDF document text
    • https://noxijinijomud.weebly.com/uploads/1/3/4/7/134746703/giwig_pavogu_bavatasuw_sofizowefexu.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/1ibe4hd/basic_elements_of_design_texture.pdfIn PDF document text
    • https://xuxozuxar.weebly.com/uploads/1/3/5/3/135326767/6320649.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/wigevuxibodukejuki.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/uQDheje/36439877142.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/fjiRgie/birthday_cake_ideas_for_toddler_girl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_6025fd10ddfd4.pdfIn PDF document text
    • https://cdn.sqhk.co/jenojigise/291hevf/35358415021.pdfIn PDF document text
    • https://cdn.sqhk.co/kidobogi/Hjggji4/49776865909.pdfIn PDF document text
    • http://zarozunaxa.iblogger.org/72629427300.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/dJaghig/8108386194.pdfIn PDF document text
    • https://cdn.sqhk.co/pulizojiwim/cpSfiz5/daraxega.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/7CmdozM/blackboard_cscc_email.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_5fd7b6b444838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384310/normal_5fc85009e28fa.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/jivazufevi/iemeigP/ping_pong_table_covers_waterproof.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ihhiigq/palejarewi.pdfIn PDF document text
    • https://cdn-cms.f-static.neIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bemefidapuwemo.rf.gd/mazda_3_2014_review_consumer_reports.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_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 5244 bytes
SHA-256: 233312ae86bbec689d875acafe49f7d09066925ff7ad15ca71e1b43b814e2634
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 10292 bytes
SHA-256: 509712e3809a444f4bb038405332694ec4cb8fa0951ff8c4543497489bbae4a2