Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c9af39b9592792…

MALICIOUS

PDF

79.3 KB Created: 2021-03-20 22:47:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfc54f55dce1a1f14ff4feda3d92a770 SHA-1: fc42a77140b4c68894f12d4141da2ecd063ae72a SHA-256: b6c9af39b9592792ed062b30ba2933ee3bfae0649de891ef211b742ce67e30bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=equipe+scale+pdf
    • http://siankaanmexico.com/sunvision_pro_24s_manual433vv.pdf
    • https://cdn.sqhk.co/mivadunoxo/DmjhIjj/police_light_2_pro_apk.pdf
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/2ba87.pdf
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/ravetuxebisidaririm.pdf
    • https://cdn.sqhk.co/dabozijide/aF2fsRG/98707959101.pdf
    • https://cdn.sqhk.co/rufebumu/ijyFggV/29621590369.pdf
    • http://summerita.fun/alone_heart_sheet_musicc6xwu.pdf
    • https://cdn.sqhk.co/merabuvi/5gihbif/dikenewidugawerolobe.pdf
    • https://bekedurid.weebly.com/uploads/1/3/0/8/130874189/lewomifitem.pdf
    • https://cdn.sqhk.co/wejuladuke/bHXjb7o/jakomomufaxal.pdf
    • https://cdn.sqhk.co/woleparos/hLifjhN/glowroad_online_shopping_sarees.pdf
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/ruxisegazavega.pdf
    • https://cdn.sqhk.co/xubipoxeguza/hbJUfgh/small_war_2_turn_based_strategy_tactics_games.pdf
    • https://dazobexureza.weebly.com/uploads/1/3/1/3/131383777/wubirerokazogaba.pdf
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/tesesenela_vesilivi_wurima.pdf
    • https://lojamagimom.weebly.com/uploads/1/3/0/9/130969840/filejoputugejokakat.pdf
    • http://springwin.space/kezefuvaxatonebexiwazowqdxer.pdf
    • https://cdn.sqhk.co/modajili/jgc5ieK/fakafuxaruga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_1c9b37bebac24386abb20a7056a56bc7.pdf?index=true
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_388dd3a914f34fc2a74ab012778170dc.pdf?index=true
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_d8a2fc190f384e31b5f081854b9d0b71.pdf?index=true
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_7e2a509ba5c444ed8269e1bbaf1fdff3.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_off0000fb44.bin
c096415bf36a6ea387889ee8d8e7eba17117cfeb3ba5720ef0d0ceaf1c3518cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 5136 bytes
font_01_sfnt_off00010cdd.bin
26a9760674b43584c9df4398884e31ee3ae401b6656f53ba8c48f5fa8f0ca41d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDD 10228 bytes

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