Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f931a89d0b375c…

MALICIOUS

PDF

101.6 KB Created: 2021-03-31 01:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aea6b882838fe2fd6c1883a0215797df SHA-1: 5a285aa9a97c3f4def085b34a096ea120edd0032 SHA-256: 08f931a89d0b375ceddf97d9622f727a44d3f60b7a31da49109ed8df55808e1b
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, characteristic of a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to exploit users through indirect redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://soxebez.ru/wix?keyword=james+berry+surgeon
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/gexezorisisesi-xesaz-lididodese.pdf
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/6deaea.pdf
    • https://dajitogaxafolix.weebly.com/uploads/1/3/1/1/131164176/bikot-mabenareso.pdf
    • http://perevod-card2card24.site/husqvarna_viking_emerald_118ax0as.pdf
    • https://dimofusuraz.weebly.com/uploads/1/3/4/6/134677966/potusewifun-tetetu-jelak-tijaton.pdf
    • https://fujolununepa.weebly.com/uploads/1/3/4/6/134683680/jukupazaguwab.pdf
    • https://telogedibosujo.weebly.com/uploads/1/3/1/4/131438044/943591.pdf
    • https://puwikopigab.weebly.com/uploads/1/3/1/1/131163601/b91854e7.pdf
    • https://dexanefuv.weebly.com/uploads/1/3/1/3/131383512/3768850.pdf
    • https://sojutobifedurex.weebly.com/uploads/1/3/4/5/134588439/7675240.pdf
    • http://geniusenglish.space/the_well_wrought_urn0idqy.pdf
    • https://mukojemugasab.weebly.com/uploads/1/3/5/3/135314074/42631e71535942e.pdf
    • http://draiwenstore.online/cervical_spine_x_ray_report2n3ry.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tipipigi.atwebpages.com/34892700428.pdf
    • http://lorovaxejavagu.rf.gd/a_court_of_thorns_and_roses_box_set_book.pdf
    • http://defakulid.atwebpages.com/22742132062.pdf
    • https://uploads.strikinglycdn.com/files/fdc6c4e4-bf3b-42ee-8b87-8cc1751e0794/speak_by_laurie_halse_anderson_chapter_summary.pdf
    • http://tosipasakuvil.myartsonline.com/airway_clearance_techniques.pdf
    • http://bilunijo.epizy.com/hand_held_sheet_metal_flanger.pdf
    • https://uploads.strikinglycdn.com/files/69390a2c-cecd-4c77-8395-c058c0b983d4/kobuzewitisoro.pdf
    • http://teropisarazo.myartsonline.com/12358187921.pdf
    • https://uploads.strikinglycdn.com/files/5d2901b2-36f6-493e-90c6-1bf480eae6d9/what_are_the_components_of_software_requirement_specification.pdf
    • https://uploads.strikinglycdn.com/files/94270ea1-9055-43c8-ab1c-9cfec6c8fd3d/60153767734.pdf
    • 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_off00014b5e.bin
099cdd29b1efd79af7f6470fe17c917ff9e5de02821ebcda2e3b92da89e596d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5E 5204 bytes
font_01_sfnt_off00015d02.bin
7435861ed0f97109f0b67e91e6cab0d26a6d443528f2c16b1ac784d1520172b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D02 13264 bytes

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