Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ad27fc8b8c2dd9…

MALICIOUS

PDF

85.6 KB Created: 2021-10-10 01:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c92ef4ef6557689941f522b45d01016f SHA-1: 24c9e71136adbe0e366f2b56c5e53c28704c5a62 SHA-256: 56ad27fc8b8c2dd9eadea46bb58c3ed79e09d4c20bbcaf5d9f29806a99549e49
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://klusjesindex.nl/images/uploads/82600389722.pdf In PDF document text
    • https://promoform.coreform.it/uploads/file/81267879550.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/29018047699.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/kezunav.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/farogelisilatixija.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/392b1a5f5f5e53569214f158fbfd711d/genavaxivexijalifada.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/finanagaxefonumubage.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/xexugewodi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1616049cb6bbf1---28110325047.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/35843373427.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/2006082656.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/17976825609.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210905041921710208.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/sokovadenilenevu.pdfIn PDF document text
    • http://boxethai38.com/upload/file/40220710526.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/62352610975.pdfIn PDF document text
    • https://manisafar.com/basefile/marcosafarir/files/20694167014.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/17253021465.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615f17e1a93aa---vudapuwibalolosorano.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/tovoson.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140530dc7b22---sodorikugometajaren.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/75013659789.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/4325133906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=firmware+mxq+pro+4k+sd+cardPDF 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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 19656 bytes
SHA-256: b4dffc53219b4ad11092c83f4592f3782758910eef286d501a236f2cb49f7309
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 10908 bytes
SHA-256: e9372e536268978cf08e11929f33ed4a313a996d26411895bc6d3af26fcc9043
font_02_sfnt_off000130da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1