Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48e4f7245ccbe43…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 01:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb2d0e08692e17b1270ba3427114e905 SHA-1: 60c0afba6c8d91c187dd50a4a32c5553f16ca5da SHA-256: f48e4f7245ccbe43c284f4c0611b34e8b4a518dc92bb57959cfc9ac5365a4c64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests it is generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of numerous embedded URLs, including one pointing to a link farm, indicates an attempt to redirect the user to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://reutlinger.pl/userfiles/file/podujadejevubufovemu.pdf In PDF document text
    • http://lifecare4all.com/upload/files/55895908368.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/8104782333.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/30606634188.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/panotape.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/mapuxi.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/44378041480.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/jupiwoxabatuten.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/texuw.pdfIn PDF document text
    • https://sanidom.pl/img/file/58688266070.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/metil.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/kulaxanazaxap.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/patijenomuxikexu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310569d26df---62969230809.pdfIn PDF document text
    • http://nincity.de/inline/file/69698063625.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/97957142207.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/vagalewojedavepurimarafos.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/jisinadesukilukubage.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/tagowori.pdfIn PDF document text
    • https://photojet.net/userfiles/file/8279556770.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/luvivujo.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/wotevisejowofaz.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/dosabazebibi.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/11661576148.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/tukipesaz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0334e51b6---fafogufalasotifuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=vector+2+game+downloadPDF 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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 10628 bytes
SHA-256: be4465fa41170cc72c56e86e3dfd5dd91a60dd75074c79167bb6444743e698d0
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 18052 bytes
SHA-256: b7ef6feaa3fed38d1b1c8d41fac9e22138327fce7b86fde61acb930c38dd0a4a