Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1364a217b61cba…

MALICIOUS

PDF

90.9 KB Created: 2021-09-10 23:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1fe59507dd00c768c211700295e2930d SHA-1: ed299a79c3b3d1b89a1decbcdfa16267eaccc1e9 SHA-256: 7b1364a217b61cba4870e365e06cf595fe03864c5599479371b8f623e5ea92d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to unknown domains and appear to be part of a link farm, a common tactic for distributing malicious content or conducting phishing attacks. The PDF structure itself is also noted as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bokaichenyu.com/upload/files/36499237185.pdf In PDF document text
    • http://gz-chengeng.com/uploadfile/files/korize.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bee235671---kivokilopex.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/2808325580.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/79570505066.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/49783638677.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/59472907184.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pabelomeruparifejiduw.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/filivuvekejakolatenewa.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/xubimezopejelonefiva.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328560a2d0b---wigulotugilame.pdfIn PDF document text
    • http://susutour.com/userfile/file/liditirunepuwubutupi.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/88782002635.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/36435383079.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wikifasonufanidoz.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/83193772858.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/neguveniwubukavasituza.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/83684896099.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/musegabedidufo.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/98908002404.pdfIn PDF document text
    • http://mobil-tech.com/files/tebiluwaxelanuvapezasaf.pdfIn PDF document text
    • http://thevalleytrader.com/files/mapevonevaniseteki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+too+had+a+love+story+best+linesPDF link annotation
    • 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_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 18600 bytes
SHA-256: 19856f4cd17f286bdc5ebfe568be421e30fdf5a91324ac388a453d622bca7b3a
font_02_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 10616 bytes
SHA-256: b9c786ee62057d56ff1fcdc3ac770276b32726b510b8e54f479367423b040f1a

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