Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4cfdb12f56eaac…

MALICIOUS

PDF

78.5 KB Created: 2021-02-28 12:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4ae376aec06a8b5afd02d82ace2835f5 SHA-1: ef9f0d50679e1ea75c5316c225490b635c41337b SHA-256: 8d4cfdb12f56eaac2af6032b1652aed91dcf677d2520dead7d450266e00d60c7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xezojetit.ru/strik?utm_term=preface+to+lyrical+ballads+1802+pdf PDF link annotation
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/rasijumemuxuje.pdfIn PDF document text
    • https://mogasijukunuv.weebly.com/uploads/1/3/4/0/134042787/5270383.pdfIn PDF document text
    • https://cdn.sqhk.co/gatidixon/iicpTr0/bikozemajofekuzopivudim.pdfIn PDF document text
    • https://cdn.sqhk.co/ramidazumiko/idDrCPw/cute_yellow_wallpapers_for_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jdji9Ek/zokosovuregogijakebu.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/kBojchd/87197620359.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/Qhjija6/73573081003.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/GhgaXib/nick_robinson_a_teacher_hulu.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/dovasawe.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/fJAhija/zozogaramirop.pdfIn PDF document text
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/9281967.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/wodizodofananefenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426075/normal_5fddda189b186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuses/52896520391.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/92420073731.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 5592 bytes
SHA-256: 6d4b1325e5e5893b8460a4e22f19a01713d535b693f12dc51d1aa66f786e4f84
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 10364 bytes
SHA-256: b882c4a176ae40842d6c0d3df4dcb1d2555737dbd1ab381e8141f895abb602fe
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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