Malicious PDF — malware analysis report

Static analysis result for SHA-256 836372d1d2766a41…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 03:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1dd5d56f0e3231cebcca6761d9c36da6 SHA-1: 26274b36d4b5a3abc0b6bc7207250bae5c78986f SHA-256: 836372d1d2766a411c900e855cdf2e257f243eec002704c92949eb3830c31978
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF acts as a link farm, directing users to numerous disposable domains, with one prominent URL being https://pistant.ru/uplcv?utm_term=super+mario+3d+world+wii+u+iso+download. This suggests a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pistant.ru/uplcv?utm_term=super+mario+3d+world+wii+u+iso+download PDF link annotation
    • http://queensparkview.com/image/upload/File/fofivetawetigoxused.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/dejusitedefabimovuzobapi.pdfIn PDF document text
    • http://lgassociates.in/uploads/34789015171.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6b2845ae2290c41c149558867dfc02d7/59569066824.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/tuvawa.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/2721990866.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/lubogufo.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/14200798823.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/76029634310.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/91432011397.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/39290039467.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/zajinizoteteku.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/91027006799.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/woranewazufofozopibugefa.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/refofisorexomufikivebe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/5037089367.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/towomenaliweratuka.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/96197005331.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613008b008f50---tikavoz.pdfIn PDF document text
    • https://goodline.by/userfiles/file/livabazevi.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/lizef.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/76252149843.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/86303737446.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/96053615563.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/tinivonujalezo.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_off0000aff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF7 10888 bytes
SHA-256: d3959d8ee8c0e03e277fc60642abf672c4a0d30e05068d69c0df05011d90e5cb
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 14876 bytes
SHA-256: 845cf38b3961dbff1f7f391c344142a878df222c25092f9fc03267b2c0fd9ed4