Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ba0eddea12b05a…

MALICIOUS

PDF

83.1 KB Created: 2021-04-11 10:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d2de89baabfe89d70e3487b54f1381a SHA-1: 1ab13bd690a5d15809d767f8389bb0d983f20e7c SHA-256: 16ba0eddea12b05a49b11c9dd33ee9b42763ee5276efe64d1a0f96f21d18ac33
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. The document body and embedded URLs suggest a link farm designed to trick users into downloading content, likely a secondary payload. The presence of embedded URLs and the 'link farm' heuristic indicate an attempt to direct users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/26688185713.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/71502920023.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/28911573484.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/78191676466.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/gegemapoxazokex.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/65810703597.pdf
    • https://ambrose.edu/sites/default/files/webform/fulakosilukubusovugatupus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=top+islamic+books+pdf+download+bangl
    • https://gradfutures.princeton.edu/system/files/webform/buviboxakutovovujigobimis.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/ruwitik.pdf
    • https://printandmail.princeton.edu/system/files/webform/26360011081.pdf
    • https://umatter.princeton.edu/system/files/webform/requests/tutoturabawukaxubudevodor.pdf
    • https://community.princeton.edu/system/files/webform/vujipudujusikal.pdf
    • https://lib.asu.edu/system/files/webform/98562832035.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
    • 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_off0000edfd.bin
c6a6ea1bbad369afe128e3ab50a98455cdd6cf80ca7d12d0e003fe86e6e17559		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 5624 bytes
font_01_sfnt_off00010123.bin
66b7804771141376e68aa58611123f1a3ecb0a9946f44483ec67f61293488726		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 12812 bytes
font_02_sfnt_off000129c5.bin
5b435656a9a7890fc5e722f4b8cb9b63b28380d26f166b4063da7f771c2cf666		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 16164 bytes

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