Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a611369831ec3a…

MALICIOUS

PDF

64.5 KB Created: 2021-04-13 17:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12dd1f2c6560614243a43d93528b4a8c SHA-1: 9c7916333a6f894d3a7b239239588d228ad90d7c SHA-256: d7a611369831ec3aef8912d80805b0c3be26f4b1c8bd24c9851d07c55c5aa14c
124 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'dog height calculator' and uses wkhtmltopdf, suggesting a lure to external, potentially malicious, websites. Several embedded URLs were extracted, with many having unknown reputations, indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8638

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 https://www.mainephilanthropy.org/sites/default/files/ziladiweropisikiforab.pdf
    • https://www.dgs-interparts.be/sites/default/files/xufatonapa.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/tekuxegejarikuferibo.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/48862039041.pdf
    • https://www.uts.cw/sites/default/files/webform/tidenopuzi.pdf
    • https://ambrose.edu/sites/default/files/webform/93854264345.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://www.uts.cw/sites/default/files/webform/xewaz.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/42283273604.pdf
    • https://www.blplegal.com/sites/default/files/webform/pifijolaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dog+height+calculator
    • https://drones.princeton.edu/system/files/webform/vijebutipide.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/68876097481.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/kuwidiloj.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5be.bin
cf7b2643d76ddd01c95cd35a6a33367eac29f14d7fa78873fb2b3134a8d48bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 4884 bytes
font_01_sfnt_off0000e65d.bin
27814374b6723436a012d1bf144d158bc64f04a6b90f65fe90e4360864c46e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10056 bytes

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