Malicious PDF — malware analysis report

Static analysis result for SHA-256 359855ef32cb4d05…

MALICIOUS

PDF

63.6 KB Created: 2021-04-16 16:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72ba9feca06d9abe79416ac0b8914f41 SHA-1: 13d755869b5a873786afa42764be7a827dabd756 SHA-256: 359855ef32cb4d05ff67a1479da6a86d0ce17b6e1a13c830e687e09ae7273ff4
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The document body, though heavily obfuscated, appears to be a lure related to an ebook, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8289

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.pharoxglobal.com/sites/default/files/webform/balulata.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/pidefukil.pdf
    • https://ambrose.edu/sites/default/files/webform/durigoxilakomisi.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/dufovomajaxavekasodulep.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/43600748611.pdf
    • https://www.a1touchsolution.nl/sites/default/files/43963154407.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=understanding+video+games+the+essential+introduction+ebook
    • https://lib.asu.edu/system/files/webform/56381184371.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/95830943344.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/52983615418.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/tivajojisepizoni.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/woragirewun.pdf
    • https://campusrec.princeton.edu/system/files/webform/93394875634.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d145.bin
68eead1e25dfcc3d97826f7ea10a13ae2f306595e984f7b57fcbd5871ae9c0d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD145 5488 bytes

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