Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac9e08f6bccb7ae…

MALICIOUS

PDF

63.4 KB Created: 2021-04-19 04:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 897c5ca00ee078b0dfd3a24f7d16ab2e SHA-1: 02d3c11ec4fb5094ba6b8bdf89070519122ce410 SHA-256: fac9e08f6bccb7aea85d99e3d31870b657de8c4112570b5852dbf53602ba5fb5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially suspicious domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oaklandchildcare.org/sites/default/files/webform/1289321409.pdf
    • https://www.termis.org/system/files/webform/nibobuzokojovafizuza.pdf
    • https://www.jsif.org/sites/default/files/webform/94808830073.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/jitebetususi.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/fapulewamekunasu.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/6669476875.pdf
    • http://portal-mysigma.com/system/files/student-proof/62332338419.pdf
    • https://www.dgs-interparts.be/sites/default/files/36138637258.pdf
    • http://seiary.com/sites/default/files/webform/rec/6045441545.pdf
    • https://www.dgs-interparts.be/sites/default/files/bipaxuvimul.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/12938533755.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=toshiba+dvr620+dvd+recorder+vcr+combination
    • https://lib.asu.edu/system/files/webform/85824103047.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf4.bin
119fab4d2a66951b5fbb49e72f7c8e93d3dbe0c0f6bedd37a1dadaecdfbc0a46
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF4 5724 bytes
font_01_sfnt_off0000ce44.bin
f34fff7f228448ab2e536cb0d51821ae76d4edb13c3c56d43b0afe64890ad5db
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE44 10272 bytes