Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ac0790aec596c2…

MALICIOUS

PDF

66.6 KB Created: 2021-04-11 11:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5572e222b318f773f2d541c2cbe154c6 SHA-1: 9eee5673ea82ba393d07040073b1f24214771155 SHA-256: 44ac0790aec596c2f38941d72dbc22803e5202265b954532d235b51bd2c800d3
124 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7585

Heuristics 4

  • 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
  • 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/85278691340.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/12812059159.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tafunowusovuna.pdf
    • https://aboss.by/sites/default/files/webform/10891008032.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/35757612566.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/dapajinosez.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/37570077738.pdf
    • https://ambrose.edu/sites/default/files/webform/71048230710.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/51762260361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=condi%25C3%25A7%25C3%25A3o+de+existencia+de+um+triangulo+exerc%25C3%25ADcios+8+ano
    • https://printandmail.princeton.edu/system/files/webform/fasulegok.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d01c.bin
8deace828370fbd413c0605885b7e2623e465eb1f061b18f15ac8ccf060e79d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 5980 bytes
font_01_sfnt_off0000e388.bin
7d37def5b252550151d564b9058254ff316a9afce6004f72b1ea691c2c533276		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 12748 bytes

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