Malicious PDF — malware analysis report

Static analysis result for SHA-256 167f8fc9ac1bff63…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 13:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15dbdcc92c393d4eb5e9e23e1c8a1015 SHA-1: c8ddad119217059d146b15d19fc7de4de3836458 SHA-256: 167f8fc9ac1bff63cf01f72965ca110c75e4355829110f6b3658c3c2d8bbb719
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO abuse for traffic redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=graph+the+following+quadratic+functions+worksheet
    • http://mexawolin.medianewsonline.com/www._dpe._gov._bd_primary_result_2020.pdf
    • http://mivukiwoluwuj.iblogger.org/guidelines_for_food_stamps_nj.pdf
    • http://bobixuposu.22web.org/36717635068.pdf
    • http://xuzerujagojagip.scienceontheweb.net/automatic_control_systems_8th_ed.pdf
    • https://wemadaxofopu.weebly.com/uploads/1/3/4/7/134752229/kakafizokeviborafawi.pdf
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/6884742.pdf
    • http://werojati.getenjoyment.net/nusolofe.pdf
    • https://pifixisoti.weebly.com/uploads/1/3/4/3/134379985/rogadoz.pdf
    • https://rofajubufilotol.weebly.com/uploads/1/3/1/3/131384128/8316973.pdf
    • http://tadezutalowebe.22web.org/annealing_process_steel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nalifij/bolero_camper_photo.pdf
    • http://ledukuxadom.epizy.com/82745292457.pdf
    • https://s3.amazonaws.com/tajimipojimo/dewebu.pdf
    • https://s3.amazonaws.com/gewisetug/printf_date_format_bash.pdf
    • https://s3.amazonaws.com/gatazeromij/woretuponu.pdf
    • https://s3.amazonaws.com/kikunojulejuj/93556207376.pdf
    • https://s3.amazonaws.com/vezumobigodub/madig.pdf
    • https://s3.amazonaws.com/zuniverijesud/2240931504.pdf
    • https://s3.amazonaws.com/tabobujimo/alexander_graham_bell_biography.pdf
    • https://s3.amazonaws.com/kufazete/43001617188.pdf
    • https://s3.amazonaws.com/vuforewebub/xowugivawagazupopib.pdf
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_0aaf3811caf84658a91c4fa53ecc99a8.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_6881ec6a5e934c4991ee3dc66ffd3e9b.pdf?index=true
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_2e326f056c5b460abdd0516ac2c2bd6e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed51.bin
2fd8ddc9c2d4a2d72c1d56bfdd424461a86573e6e02ebc94a233bfaeba650173		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 5728 bytes
font_01_sfnt_off000100db.bin
ed177be6760322b63ad758978ae274ff76f9721fb8f193687afc2f74c01c5218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 11128 bytes

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