Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd0c0a3d35aae7c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 06:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c326c096be5ee164eb5b4c5f910ad317 SHA-1: b332eca6acaabe63a495c0d4d2c9f9f92a6b7593 SHA-256: bfd0c0a3d35aae7cd5825a6fe4eb5abb6ca0fb3645c7f2541abfca03de6b7c86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample as a link farm on disposable hosting, further supporting the phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=download+vice+city+apk PDF link annotation
    • http://parkergeneralcontractors.net/userfiles/file/6388363482.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/bemosupom.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/dexowi.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/toxopug.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c46678de05---xuzixif.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/37040973325.pdfIn PDF document text
    • http://kesifveotesi.com/files/zemimulerujuz.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/pujuvanajisivalaj.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6525509158.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/32950642397.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/22137320778.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/zibetanesibagafakemev.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/46840342279.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/wetesoneburajosavokonike.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/bekenolugetopufivosu.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/tagudoxibeziri.pdfIn PDF document text
    • http://sql110.com/pic/83616894171.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/75114007313.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/navirasiwun.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/putasak.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/vusatabiv.pdfIn PDF document text
    • https://pindimana.in/uploads/file/47655297847.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/nasoxobodelu.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210902161214.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_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 16732 bytes
SHA-256: bb6180ed9c3060dbf013d04d7afc8ef442cf16f26900a677533222538bf61c55
font_01_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB44 10596 bytes
SHA-256: d95bd9eabb782e0d71e9a9fc06fbe0799673ff05b9eb204976f4170dae896b80

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