Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9acc75ea0e88c25…

MALICIOUS

PDF

89.4 KB Created: 2021-03-13 22:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61d71d083a33b05c1cbe03c58af9f262 SHA-1: 5add713723c0ca6a73c154d70687f73d3ca292cc SHA-256: b9acc75ea0e88c2591438624a04125cc1986d05d30a32a3f3197ce9ed60037ec
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm with numerous external URLs. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links, likely for malicious SEO purposes or to distribute further malware. While no scripts were explicitly extracted, the PDF structure itself is being leveraged to host these links.

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://vilenefex.ru/wix?keyword=hostel+4+iit+bombay
    • https://cdn-cms.f-static.net/uploads/4488116/normal_602243b256d1e.pdf
    • http://pinopizo.sportsontheweb.net/yasin_dua.pdf
    • https://cdn-cms.f-static.net/uploads/4454966/normal_602f99a16c703.pdf
    • https://cdn.sqhk.co/dubagelojuwe/pNiashj/fart_soundboard_pranks_jokes_ringtones_funny_ringtones.pdf
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/kebeboxopugazigix.pdf
    • https://lumirofelefepo.weebly.com/uploads/1/3/4/8/134892557/6243dd73f05.pdf
    • http://vadosaj.getenjoyment.net/2006_honda_civic_hybrid_battery_reconditioning.pdf
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/1d8d2b.pdf
    • https://cdn.sqhk.co/muwanije/hahahh6/bitawamoxaki.pdf
    • https://cdn.sqhk.co/japuwejede/hdieF2z/kedodupobam.pdf
    • https://static.s123-cdn-static.com/uploads/4470209/normal_5feb605db02e5.pdf
    • https://cdn.sqhk.co/wunokebewoz/gjhcibR/mavubisimoderotaguzafu.pdf
    • https://cdn.sqhk.co/futogifoku/BihcYhg/xafoxofuxeje.pdf
    • http://rejemezurufoveg.mywebcommunity.org/bolsa_de_valores_mexico.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6041f3823ebee.pdf
    • https://cdn.sqhk.co/wobuwaseja/5evTMib/androidx_data_binding_example.pdf
    • https://cdn-cms.f-static.net/uploads/4486190/normal_60129fd76dd63.pdf
    • https://cdn.sqhk.co/xezojutatow/ijgeHdy/53572115114.pdf
    • https://static.s123-cdn-static.com/uploads/4416510/normal_5ff97e0208ede.pdf
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/fosexetujubube-verusisexe.pdf
    • https://cdn.sqhk.co/kinibemazoz/WW7B3qR/yeezy_350_natural_outfit.pdf
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5fecae66121bf.pdf
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/nevibal-nitixonenoxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejesezape.myartsonline.com/descriptive_writing_for_grade_5.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_off000120a2.bin
c61fbb21c08248a44bbd636d81fbdb4dbe375dbf6b476a13b3123d04d875d17d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 5024 bytes
font_01_sfnt_off000131b0.bin
c174d253955d99f473f82c93ee2d84b0909b9dcc84e6c16f30940c674666c74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 11656 bytes

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