Malicious PDF — malware analysis report

Static analysis result for SHA-256 8967bd336b87ffe9…

MALICIOUS

PDF

82.3 KB Created: 2021-02-19 16:46:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 123ba82cf78ead302ded29244a21aac1 SHA-1: 2c15a7474b649d5654401d532e71fcac5503ea55 SHA-256: 8967bd336b87ffe958ec1ca71cfd81915d82630073828f4bd59c6d0d3740c7f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://crophysi.ru/strik?utm_term=signs+and+symbols+vladimir+nabokov+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486374/normal_6014206a1c087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_602c7f99b7353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fe8b18730ce7.pdfIn PDF document text
    • http://femokotafi.66ghz.com/95705407670.pdfIn PDF document text
    • http://legiontry.online/42228704285ol3aq.pdfIn PDF document text
    • http://vk-settings-change.online/duxidufg0nig.pdfIn PDF document text
    • http://azakalaza5.xyz/verbos_regulares_e_irregulares_en_ingles_en_pasado_y_presente3knni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_5ff64a22d5456.pdfIn PDF document text
    • http://itsamorem.com/93894258323x3zem.pdfIn PDF document text
    • http://doctora.club/eclipse_ide_for_android_sdkcojm5.pdfIn PDF document text
    • http://nesibobivugo.iblogger.org/bunoweb.pdfIn PDF document text
    • http://nejozewowedona.22web.org/sweet_shop_game_free.pdfIn PDF document text
    • http://yewes.fun/kikanajekimofox0tj5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_60191c7fca1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5fd14e4f850a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fivasire.rf.gd/96740480820.pdfIn PDF document text
    • http://wodefelid.rf.gd/basic_assumptions_of_economics.pdfIn PDF document text
    • http://kodireso.epizy.com/suruxiketojomeleganof.pdfIn PDF document text
    • http://lebozid.epizy.com/john_deere_x304_manual.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 5828 bytes
SHA-256: 8cd915bc8d646df8d5d813354dde471c5217a023d986798b4ddd685460465928
font_01_sfnt_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 10804 bytes
SHA-256: 81d636762b144e1b3d48bbe804e6c772ba8302d9a6c559004987c7869290194e