Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83ddbc3d068b731…

MALICIOUS

PDF

87.3 KB Created: 2021-03-11 07:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be6a75899ac2bc69c61ee00535e06bc2 SHA-1: 16daec6a32f7f078fa6f1455a6a12b570609cfef SHA-256: d83ddbc3d068b731da03113635ee9a4cf795bbc5fe0e83d6d2bea13b01ec515c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful sites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of a malicious document designed to exploit users.

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-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://pelibifir.ru/strik?utm_term=spanish+worksheet+preterite+tense
    • https://cdn.sqhk.co/woselukafo/h5QKifT/stickman_archer_apk_uptodown.pdf
    • https://zusiwujewanu.weebly.com/uploads/1/3/6/0/136054437/956bac8578f1cf.pdf
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/37a35fd356f0.pdf
    • https://cdn-cms.f-static.net/uploads/4473035/normal_6030378f76e52.pdf
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/tumegelotewuto.pdf
    • http://kexedeziferu.sportsontheweb.net/64764793160.pdf
    • http://tuzirawejaw.mypressonline.com/80244047547.pdf
    • http://fogejebimo.scienceontheweb.net/lipuxojorivoxifav.pdf
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/972033.pdf
    • http://loveantravel.xyz/49019878248l7u0g.pdf
    • http://stavki.link/how_much_is_ipod_1st_generation_worth5gzrd.pdf
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/7058136.pdf
    • https://sajakuzotile.weebly.com/uploads/1/3/1/0/131071181/vilufikokiv.pdf
    • https://cdn.sqhk.co/jaxugaveg/hbhbl0O/wewejawagotanenisupav.pdf
    • https://static.s123-cdn-static.com/uploads/4365549/normal_5ff23c1c43a4d.pdf
    • http://bbbbbbbbeeee.space/chicken_run_ideas_cheapr59t5.pdf
    • http://xefawojuj.mygamesonline.org/gavaganuvajes.pdf
    • http://maddot.space/35958039301hbtv1.pdf
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/difepino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dapibudajemuk.atwebpages.com/the_z-score_associated_with_the_98_percent_confidence_interval_is.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f039.bin
35c5095b09038166dabcc9511f08d883237700d4b238878f4343d72c12128d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 4920 bytes
font_01_sfnt_off000100e9.bin
eb2b509901e1672b3adf2f40f884940942046180285d8a481fd532f0f2756385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 12032 bytes
font_02_sfnt_off0001286b.bin
881126320ea04c2eaea05ef6e4b500007eef3914f25984c447bd6a71dca434e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 17660 bytes
font_03_sfnt_off00014174.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14174 4324 bytes

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