Malicious PDF — malware analysis report

Static analysis result for SHA-256 db03b14ae1f1d7ae…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 08:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9581f5bb91db06bb1848ef2928966260 SHA-1: 4571ff296ac0ab6b27c7f67138a23c6b1a2d3a80 SHA-256: db03b14ae1f1d7aefef5765dd4b1bd11543af930bf28f8d8129117afa148167f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ltpbetel.ro/userfiles/file/65817299149.pdf
    • https://ctners.com/ckfinder/userfiles/files/diviriw.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/kixowitumem.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/suzixikifefelubefaxiv.pdf
    • https://tresonance.org/uploadfiles/kesatonufikoledosusetazer.pdf
    • http://hcbarrett.com/user_area/file/6332869510.pdf
    • http://smenergy.kr/uploaded/file/54137815561323a624a724.pdf
    • http://danieldesignpro.com/userfiles/41326369619.pdf
    • https://suprastoc.ro/userfiles/file/nuvizunetowizosed.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/foseda.pdf
    • https://yptea.com/data/fckeditor/files/pediw.pdf
    • http://tsuiteru66.com/userfiles/file/70076530047.pdf
    • https://xlspandoek.nl/userfiles/file/totinelerezadu.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1005011100f5cd6322ad106e82f9ebee/bugadirowuwakozajanum.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/55378991430.pdf
    • http://rainhouse.kr/data/editor/file/1554842472613d2a30665ff.pdf
    • https://perfecthospital.org/FCKeditor/file/kubijonexulimogedewedulo.pdf
    • http://cudicio.it/images/file/susorinujoxelu.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c5a7a53f158fd0246bc2c36962a179eb/teterufubot.pdf
    • http://taispacedesign.com/upload/files/21581967740.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/wedaturujedopilafefakax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=netzwerk+kursbuch+a1+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f3.bin
c569a685108a0b48090a7c0ddf864a30d3a3af009fdd62d9814b008b437d8db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10860 bytes
font_01_sfnt_off0000f32a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16792 bytes
font_02_sfnt_off00010b3c.bin
03a7b97fb23dc64f50765e5e81e01b2128adfa8f3d4b1cab0e61227276d4bb41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 19644 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.