Malicious PDF — malware analysis report

Static analysis result for SHA-256 c440def6a494544d…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 17:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cddad65f6e5753dae5358b37b8e5dc4f SHA-1: 7c2ebb45a279236078f0b02e0a44b25eb4b2193a SHA-256: c440def6a494544d2a231dadad5f4afc66c15fabf5e67959d332c23e72eb4cf5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action and hosted on disposable domains. The presence of numerous external URIs, many pointing to suspicious or disposable hosting, further supports this. Although no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly indicate malicious intent, likely involving redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 0 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://catamma.ru/uplcv?utm_term=best+android+apps+to+read+pdf+books PDF link annotation
    • https://www.winsum.frl/ckfinder/userfiles/files/67727395968.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/87535594575.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210918144359454431cx2ja.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/biwopikenivasotosa.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/47891000017.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/kegoluzegaluludefi.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/17317313559.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/52952994902.pdfIn PDF document text
    • https://2acontractor.it/images/file/50437709838.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/miwimonifakosewigutu.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/70052463488.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/8388910669.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/36920995834.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/2650026741.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/72920587057.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tifufoned.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/galunixogozobotulabaxoge.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/1771451191.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130321409bc3---dezomatugutagazole.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/10342603807.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/wenudafo.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/52762385535.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/93127486318.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/romus.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/21294136376.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_off0000afc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D2 14308 bytes
SHA-256: 314b9aa69ac165490c4367b6750a63c5c72dff707a3084f24cbf25811389d5c8
font_02_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 10732 bytes
SHA-256: eede3de1506cb0007dc59d6893447342016ba69b74fec3a1434b5016cf9cda7f