Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32b5f37e39e8725…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 21:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bed54a459864f2c5ab019435e363ba6a SHA-1: 8da521b9617a82754479cc7407ba5e21c5d4c915 SHA-256: d32b5f37e39e8725e18556ebee414d4bd8f94f5e327f498d435a9acb19645d15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to disposable hosting sites. The primary URL suggests a lure for downloading 'cool reader', indicating a social engineering tactic to distribute malware or unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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=cool+reader+download PDF link annotation
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tunimorugodutiwijej.pdfIn PDF document text
    • http://bastola.org/userfiles/file/xanaxoludomumisoxirebude.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/jenuteduzuganupe.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/14501093261.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/juvonijamifovilixiza.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/5703564064.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/19340140552.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/fijufa.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/96269125862.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/90195414240.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/91817741676.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lifodupo.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/35510985726.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021926_1778459300.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/33295936437.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0e9158e1be663c28ef896e332f6d5aa7/6672888718.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210911102914_iiv9zy.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/bozejoror.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/murotoguzujatazadu.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/wexefa.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210913_111019.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9e8cc3b66c0b24bd1665ed37708df006/gevuretubepinanobobuvape.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/wipiluwirexagevu.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_off0000bc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC79 10000 bytes
SHA-256: e482c83ac7ec47ce65726e16a4ec021e755e7f172860257538472c1a18d936f3
font_01_sfnt_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16696 bytes
SHA-256: 8e8a1c236ec39b161c45ac6c1393ae409016f2ce3169d2f425aff1bd0e9b8842

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