Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d83f751b9e83c9…

MALICIOUS

PDF

68.9 KB Created: 2021-09-10 08:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fde4a09abbdfc61c3e66beb4b6871c02 SHA-1: 42a59987ce2285077cc3aed29b65426521ea8653 SHA-256: 40d83f751b9e83c93e95386ec86ba72dc4efd025d00d0918718616a43610b7ba
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, containing numerous external links to potentially malicious sites. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded links suggests the document's purpose is to redirect users to attacker-controlled domains, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 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 https://pixomot.ru/uplcv?utm_term=video+converter+to+mp4+for+android PDF link annotation
    • https://soi.icami.mx/ckfinder/userfiles/files/gobeta.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/20994784868.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/tojorusudiporajamubizetas.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/nifisitodedosobomarega.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/mekogogo.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/bafuv.pdfIn PDF document text
    • http://gdgom.com/upload/file/210903235807487161g63b538solk9.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/19082722281.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/49150078769.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/20931815759.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/59815509059.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/12444917012.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/monekurofotiz.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/83640695599.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/putoxixeb.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/rubaj.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/50123595027.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b1586b9eb33228f61e11b0329cfe3142/34836197179.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/nezubujuvosimofifiguluwoj.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134d6591d289---34256628079.pdfIn PDF document text
    • https://pr-dienst.ch/file/romipepulode.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/45308815678.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemuvo.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/joxexumo.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/64664833329.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/fizufokedokatopar.pdfIn PDF document text
    • 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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 10680 bytes
SHA-256: 16ad4af9da364d05e0bdcd26b6476b250fb6c57d75c76c08d5cbb619d4d6e686
font_01_sfnt_off0000ca95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 14136 bytes
SHA-256: 8e7f0c9e259fc2f5597a8387737f18b0044f01232ff29e36eef0027d04c9c7b3