Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb659f475e24ef4d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-16 06:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2a64f77f13b873d192844c06fb08243 SHA-1: c8e8a91b4deaa2cd298d5818dcf0668db5ce254f SHA-256: bb659f475e24ef4d2b031deab7e24c9da9b14bb70d4b6efa9a23e34f2514385b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=can+you+program+a+universal+remote+to+a+roku+stick
    • https://zazewefagawi.weebly.com/uploads/1/3/0/7/130776698/dakenezixorikarajobu.pdf
    • https://cdn.sqhk.co/xeposetuge/f9QhhN6/stick_fight_the_game_mobile_apk_uptodown.pdf
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/mesebob-fatupisag.pdf
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/8294952.pdf
    • https://bonagimeduvutup.weebly.com/uploads/1/3/1/4/131453121/falofuwopub-rufumo.pdf
    • http://kakafeg.scienceontheweb.net/vubipedovalosisal.pdf
    • https://cdn.sqhk.co/zavilisuga/ckjfjcc/desmos_graphing_calculator_table.pdf
    • http://bivaxosufuxibo.mygamesonline.org/31691213306.pdf
    • http://xepidenad.scienceontheweb.net/26786688000.pdf
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/b3eb48c51509ee.pdf
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/2bb5111.pdf
    • http://fezelegafefuv.mywebcommunity.org/python_built_in_methods.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xifimerin.onlinewebshop.net/32263122236.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_f59bc032ca284ad486b1c3ece6f61962.pdf?index=true
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_28aabb2ab87341a784cf5711ee9eaac7.pdf?index=true
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_5b5ad65002c8494eb5bce17d5a57e566.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d971.bin
22d45bb69503a4aeee8faccd788b7f7c988dcfa39c107f1f7a7fe435149edcaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 5384 bytes
font_01_sfnt_off0000ebc9.bin
8e178e6034c92e4d881fef975ed79d6070a59eebe9796d5622471fdeccda615f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 10700 bytes
font_02_sfnt_off00011075.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11075 4324 bytes

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