Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a54c4443461273…

MALICIOUS

PDF

65.6 KB Created: 2021-04-18 00:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 184bac81021a60ffd00efc5f06007a28 SHA-1: 6a6e111493e9e1d1848174cb786a029f79000286 SHA-256: 76a54c4443461273e915748f98edcf04583810a7aaffc3a88243b2ac29427927
124 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting. The ML classifier also indicated a high probability of maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct lure, but the overall structure and heuristic firings strongly suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

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://klm3fg.grhosting.cz/sites/default/files/webform/files/15194676649.pdf
    • https://www.a1touchsolution.nl/sites/default/files/56489371510.pdf
    • https://www.dgs-interparts.be/sites/default/files/60165950635.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/75468476758.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/gafazibo.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/19824170549.pdf
    • https://www.uts.cw/sites/default/files/webform/89737617204.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/jitebetususi.pdf
    • https://www.a1touchsolution.nl/sites/default/files/jonalizavilivoduse.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/beporu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stihl+ms250+chainsaw+repair+manual
    • https://community.princeton.edu/system/files/webform/vujipudujusikal.pdf
    • https://www.vub.be/sites/vub/files/webform/16824703900.pdf
    • https://printandmail.princeton.edu/system/files/webform/26360011081.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72a.bin
aa3abe1ccfc4263a957cf0fb29b9e083c4de9e0ee693f33af3358f446864c841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 5768 bytes

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