Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5451fac794a12f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-13 22:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec01dfa7a260ec5f5246a9011b302544 SHA-1: d136673bbcd7a1608fcf679f2ce462d3939b113e SHA-256: dd5451fac794a12f03232b4006ebf9bf618c4542b3ddfcbcebe195dbd3d2b42d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, employing an image-based design with a hidden clickable action. Heuristics indicate it functions as a link farm, redirecting to numerous external PDF files hosted on potentially disposable domains. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it is designed to lead users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://adabaskimerkezi.com/upload/file/51193629507.pdf
    • https://altstudio.be/app/webroot/uploads/file/13342520470.pdf
    • http://alfadent-volg.ru/images_uploads/files/95858713141.pdf
    • https://crbz.ru/userfiles/file/57505618978.pdf
    • https://radiosmile.hu/upload/file/nugatajijub.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naleluginaxevexi.pdf
    • http://oilmachineydy.com/d/files/lulutumakurikesozoxigo.pdf
    • https://clubesolbra.com/uploads/files/54291683448.pdf
    • https://terlickodds.cz/www/www/fckphotos/file/pipagekunefaxadujomiruxom.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/38464594704.pdf
    • https://trsoftyazilim.com/genelresimler/file/20029772365.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/709irkpv2qh9m0u64spfc0jpf6/ranelutuzag.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/19876519232.pdf
    • http://www.frank-diagn.hu/userfiles/files/68910102344.pdf
    • http://ketnoikienthuc.com/upload/files/dutimipog.pdf
    • http://semihkerpiccilervesupersound.com/upload/file/85658657702.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/21995396249.pdf
    • http://cyuansheng.com/userfiles/file/30004326914.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mrpqru6sgf85gpr9cda212e6nv/6992052058.pdf
    • https://safecampus.in/cmsCart/upload/file/7898898406.pdf
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/88882403451.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/bosakeniludivowowa.pdf
    • http://schokoladenbrunnen.de/idata/tadoxejonififetefufasupe.pdf
    • http://thermcom.cz/userfiles/file/7740551411.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+acestream+android
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b273.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB273 16792 bytes
font_01_sfnt_off0000ca8a.bin
a730bc98b8e13c25073e2d45761ae39421b0e7d83cf132f5e72598099a878268
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 10620 bytes
font_02_sfnt_off0000e2d3.bin
797615d985519f9e0ee178ba7ef96fb1dfc2b0cdfb332104d6d6181740042a9e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 14092 bytes