Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8379a9f7b37ae2…

MALICIOUS

PDF

73.7 KB Created: 2021-03-15 16:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 87d01cd66892b533678cd213df0bd3f7 SHA-1: 98ce539c3799055968afa8aeb19ad8e1b6bb199d SHA-256: 8a8379a9f7b37ae2b502fe867bdc4a1fd047f53b5600758409f8d675528e5b01
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://mezovuduw.ru/award?keyword=parasitologia+humana+neves+13+edi%25C3%25A7%25C3%25A3o+pdf PDF link annotation
    • https://cdn.sqhk.co/jaxugaveg/tgfs7ja/callaway_mavrik_graphite_irons_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5fd9657f4f7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_602e3edf93dda.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/g7Egfhg/retepogigeraxiduzosovoso.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/94b7442045.pdfIn PDF document text
    • http://pisifivomi.22web.org/90003846961.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/b6e149816646e.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/jhjggeg/91823495146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462688/normal_6038d1f44cfd0.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/AggieTk/diners_club_us_application.pdfIn PDF document text
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/375142.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_aac6bacdfb204457ba0fec3d8888a75e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/26356030246.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_b2743a005dae4e5c80387a4cd851dd90.pdf?index=trueIn PDF document text
    • http://zimemotom.rf.gd/dim_lights_thick_smoke_sheet_music.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_e96940585f2e45dfa71327dbe696e01f.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_50ba179eb654406ea50bff8387d2683c.pdf?index=trueIn PDF document text
    • http://jumiwamajep.rf.gd/tawifajulaxoluzidus.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/bofevarasaku.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/46528760092.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/sexuluxifalofetizosina.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/bidofitugadegepumafu.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_8299ec4306e34ccf8f9d90e5a1a63216.pdf?index=trueIn 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_off0000daa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 6232 bytes
SHA-256: 9b8948c01550f0cc326a3605500118fd3099ba76b4855561e8bd2be103e0bd31
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 13312 bytes
SHA-256: 4e2be03a59d21fbc3f4e5d86d87abae1ec2f16e5e503d4a08d087e7052983b4b