Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f438cb9aeca66b8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-18 23:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3e49cd4b7493057b816f5bda8e6d983 SHA-1: 9ef196ee24b8e1374bec03553856a03d26e27667 SHA-256: 6f438cb9aeca66b892ac3ac914d6723447553dfbb3a7816f9472a05bc9398747
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable domains. While no scripts were extracted, the presence of numerous embedded URLs, many pointing to potentially malicious PDF files on various domains, suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://efnnma.org/files/file/38804526866.pdf In PDF document text
    • http://www.fashiongale.ro/userfiles/files/27861084096.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/pubizokapirorazol.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/58974987842.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/xasusodisi.pdfIn PDF document text
    • http://mobitransjogja.com/files/17005403955.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/19308574233.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613821b3b0fec---27783414865.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/vuvutivaxiladadejunajanis.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/kokekizejamo.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/doregafuse.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/16026215807.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/nusavidatewajeb.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe2cf2e85---97625575616.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/sonomurat.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/46484470585.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/jeparonesinek.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/fudabigubinaruzulek.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/98653766063.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/xalosivokusakefovuze.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/27683226368.pdfIn PDF document text
    • https://tckontrola.hr/files/6668483345.pdfIn PDF document text
    • http://waypl.pl/upload/File/kemumanejifiwekunopoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+change+country+in+androidPDF 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_off0000bf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7C 16424 bytes
SHA-256: abf54f897369dbade0bba50b11a5dcd9a6cf303fae529c7e3c3ccb2b2f76e8f7
font_01_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10724 bytes
SHA-256: 73f4b56c61c9c42da6721537704bd14355418523342d79e6c6c75da7bfcafb67