Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6d515865676c9a…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 16:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bfc72ffe73e9e49dfff9b61964119b77 SHA-1: 252bc258500d6051f11ed58c69ddee1b9d8e18ac SHA-256: df6d515865676c9a71a576ee091f0b9423a0baf1fe0a0cdce8250be4fc0437f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains a link farm of 24 distinct domains, many of which are disposable, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

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 http://tzsunup.com/upload/sadad.pdf In PDF document text
    • http://residencelesaline.it/userfiles/files/36904027679.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/21549722363.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/jofapoxejuvulu.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/42631526557.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133b35548f28---30448823662.pdfIn PDF document text
    • https://agatanorek.com/files/file/54491987817.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d079b11fc---66234114848.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/64672358364.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/xewas.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138390fdfa91---bufegiroxovasixuvewuli.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/1942561590.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/14512015379.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/94796777925.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/30551025689.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904053438.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630809415.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/fiwoferavuzenejafubogol.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/tabamebawupomorodotopat.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/31016659318.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/54653091234.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/vebojugibigifevof.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/24029844105.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/42270380369.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=homelite+generators+manualsPDF 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_off0000e836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10540 bytes
SHA-256: d36b1f5e78459ddee168a60f09242f3c06332c2ddb4ba16914c88cb30eda08ba
font_02_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 18760 bytes
SHA-256: 9c435ab04e0b9e50a3b42353a886ee14e8f249ac6571e1a08f15ea7947937b3b