Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0014a99d3a94bf3…

MALICIOUS

PDF

81.8 KB Created: 2021-04-12 05:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5af32347c87660a3ca3e8e9db5941f35 SHA-1: 08dcfd16e4c26d25154318eb34b2fe116a70c913 SHA-256: f0014a99d3a94bf3e290910a383ffc11056f2730f202a059aff2934aec34e7cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the final malicious destination, and the document body's reference to a 'free download' reinforces the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cicatsalud.com/html/sites/default/files/webform/sidetarebuw.pdf
    • https://aboss.by/sites/default/files/webform/32639212941.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/sabaw.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/dalobasowi.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tatemomolefifepa.pdf
    • https://www.termis.org/system/files/webform/vomijalikuwukilowerosi.pdf
    • http://spotlight-sites.com/sites/default/files/webform/wokasonexigugeb.pdf
    • https://aboss.by/sites/default/files/webform/80384466065.pdf
    • https://www.dgs-interparts.be/sites/default/files/viwiredozilopuvotudulufez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hoard+of+the+dragon+queen+free+download
    • https://campusrec.princeton.edu/system/files/webform/34970544405.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/juvuwudonuvusenovirem.pdf
    • https://lib.asu.edu/system/files/webform/nexeginexepor.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/7842358922.pdf
    • https://www.healthdata.org/sites/default/files/resumes/sutuzosugogaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057a.bin
adcb765bd5e9a7d8220940dc43991a13e851685f1f3bf4cd2c7cd7c3e7765fe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 5168 bytes
font_01_sfnt_off00011712.bin
fd0e123096844a1c892d4bb4cc680134eed3b4cfea89ba005c6218c58ffbfbd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 12316 bytes