Malicious PDF — malware analysis report

Static analysis result for SHA-256 727a5437e1448297…

MALICIOUS

PDF

74.5 KB Created: 2021-04-19 02:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73585b540ee295862e2a3eafd9425b02 SHA-1: 512a6a50458c1c1156ab607202cc5cc89e5e130b SHA-256: 727a5437e144829721aca41384e8e244cad9e23ed3e37c39a92580732a87adf1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious purpose rather than legitimate document sharing.

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://cicatsalud.com/html/sites/default/files/webform/21030689395.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/gurasijam.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/bavowusakixonodokuja.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/vetasitumuwogemukuruv.pdf
    • https://www.woonsocketri.org/system/temporary/webform/viwubamonutimujogigifowi.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/6948618973.pdf
    • https://www.jts.org.jo/sites/default/files/webform/1653940235.pdf
    • http://www.friendlycc.com/sites/default/files/webform/zuguxinukebezukul.pdf
    • https://www.mainephilanthropy.org/sites/default/files/49101071505.pdf
    • https://natsihwa.org.au/sites/default/files/webform/degajakuko.pdf
    • https://www.jsif.org/sites/default/files/webform/95147346690.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/238550972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=national+design+specification+for+wood+construction+2012
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/68876097481.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/65910459182.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_off0000e031.bin
7e8d9c8f643495062bc45021c405f3f5ef3a7be4879c959af093a88dc4e8d459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 5708 bytes
font_01_sfnt_off0000f3d4.bin
c8490be05fd1e9fe81ef7cf8423fafe3e12961230b1184a641c02d308a8f279c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 11572 bytes

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