Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc22cdb7fcbcb67c…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 05:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43d74af9de479c242574f7dabdbcdfcf SHA-1: 5ee3218e757dca512f8de1104fe52bb9712665eb SHA-256: fc22cdb7fcbcb67c44ab08990f32a43449991554a62f9964f5eb1abf453d62ee
146 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Numerous external URLs are embedded within the PDF, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=android+1+car+games PDF link annotation
    • http://weingut-suppan.at/files/zodoliridid.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/28925354703.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/32212862570.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/30511068327.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/xeruli.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/73959171295.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/suluvagivamezo.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/mepemejugupezevime.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/gajazeroxedumi.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/63619010625.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/4310060566.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/87290289885.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1d0723c33cba018043c4ce7214264c35/58301347100.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tejobif.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/83252149650.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/wurisam.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/93295026420.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/14197573425.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/47091649149.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc22d02c84---77444796606.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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10600 bytes
SHA-256: 8addbfdff512e875c4e3a11a46ea0a50a0d3ea0c4ed5e51415cf181ae36e0883
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 17608 bytes
SHA-256: 59792c1e3ed204a93e44bf742b2d4ca69c731b8b28654d958be9d3ce907748ae

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