Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24bef48dec26fd1…

MALICIOUS

PDF

77.4 KB Created: 2021-06-08 02:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a6dbf91d8087ea2837a6e08e40a1bb5d SHA-1: d56ef36d1c4e89398bf6b7f8cdaac9bfa0496eca SHA-256: e24bef48dec26fd1b591ad4d352c0853f03b0513af1b378f9dac456e4c5f846b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, such as 'https://allytemp.ru/pbw?utm_term=1983+yamaha+virago+service+manual+pdf', are the primary indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://allytemp.ru/pbw?utm_term=1983+yamaha+virago+service+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367912/normal_605f487e0d4cc.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/6331217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_602a15ed39345.pdfIn PDF document text
    • https://ravaratu.weebly.com/uploads/1/3/5/4/135401011/10fab03b3aa639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd31548af172.pdfIn PDF document text
    • https://gitutibilaralib.weebly.com/uploads/1/3/1/3/131384503/tamejomubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_60354e19e7916.pdfIn PDF document text
    • https://nilanifek.weebly.com/uploads/1/3/4/4/134466172/napidigu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485310/normal_5fc81336805bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461201/normal_60005adea3c74.pdfIn PDF document text
    • https://watekoruruvuwup.weebly.com/uploads/1/3/7/5/137516493/7725732.pdfIn PDF document text
    • https://wasoxojeroxinab.weebly.com/uploads/1/3/4/8/134888233/genawod-selasamogex-xusowo.pdfIn PDF document text
    • https://runaxaneked.weebly.com/uploads/1/3/4/5/134505854/gixug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492259/normal_6064e12bc4568.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
    • http://jolunatimavu.pbworks.com/w/file/fetch/144504549/how_to_conduct_a_swot_analysis_examples_strategies_and_templates.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/strategic_marketing_planning_notes.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/w/file/fetch/144647652/the_lottery_answer_key_commonlit.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/28028640087.pdfIn PDF document text
    • http://xumefosux.pbworks.com/w/file/fetch/144579579/60105319801.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/nanapilezenax.pdfIn PDF document text
    • http://mivegaz.pbworks.com/f/claim_weekly_unemployment_benefits_ny_phone_number.pdfIn PDF document text
    • http://likanegi.pbworks.com/f/plant_propagation_and_nursery_management_agrimoon.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_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 6004 bytes
SHA-256: 8e7b54e2bc9df8ece5f931fc638de2ee4c8c2f3cce09494a93f0411e4a6789ea
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 9880 bytes
SHA-256: 345b90e9d698710664569bd44d7526076116c096f70a24951101b2f16b9f597d
font_02_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361