Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab2dec88aefa8d3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 06:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7732e6f8fd3549a091858919a5817c4a SHA-1: 56d87df28525517d719de394f0a126787528ea26 SHA-256: aab2dec88aefa8d3e78f8f9c26cf75742337de025135eea78e7fa7e35d037229
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm with numerous disposable URLs, and a visual download button lure is present. The PDF likely exploits a vulnerability to execute a payload or redirect the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jous9hcsmcg4tk0bd6ioh5o9de/duxeji.pdf In PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/75778984454.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/50851043461.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/gominesixufuxerexewitowol.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/badojirovubererira.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/kibatudaz.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vesuvewolivapibakuno.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109031852025485.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/60355720939.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/tetapopivijarexojapidagad.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904173551161397.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/zaxasuviz.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/jibekogekozuko.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4c2fbe29191ccda074795b3dac806f4/zirurutezonofo.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/wifanemuba.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/91263485424.pdfIn PDF document text
    • https://lapakunited.com/contents/files/32479661244.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/52319085239.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/78385860189.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/4718849210.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/tiwetunanonuna.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/pafoban.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/sezipozizimosuxuli.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/duzagetenoxadoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ml+hack+diamond+apk+2021PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17356 bytes
SHA-256: e99b40b2659589c799247fa5b9eeddd7e2d2ad078c1a21e8e9b3aa163555a22e
font_01_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 10660 bytes
SHA-256: a83b52bda801cb347ea1eaf09a809ca5762fbab7b65b3b377c2c9924c90dd8b9
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1