Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc9cddebfd0b894…

MALICIOUS

PDF

74.8 KB Created: 2021-04-22 05:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ba705fdd8603c5a3258ec20b0b0178e SHA-1: 30f92f959019fa77d7888c5c874ab08f8580a763 SHA-256: 7fc9cddebfd0b894656f9a59f7ed98db868a8e37a29897077a853bc33bf3ce79
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on educational domains, likely to appear legitimate. The document body, though heavily obfuscated, contains keywords related to "Webasto diesel heater problems", suggesting a lure for users seeking technical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9730

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://ambrose.edu/sites/default/files/webform/71048230710.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/taxevoxasubosiwugudabi.pdf
    • https://ambrose.edu/sites/default/files/webform/fabifuturofutip.pdf
    • https://www.uts.cw/sites/default/files/webform/58994315224.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/69774832497.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dozigax.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/86947183128.pdf
    • https://www.jts.org.jo/sites/default/files/webform/96043924660.pdf
    • http://seiary.com/sites/default/files/webform/rec/6045441545.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=webasto+diesel+heater+problems
    • https://lib.asu.edu/system/files/webform/liwubuwivak.pdf
    • https://drones.princeton.edu/system/files/webform/zifogisabivaloxigisosobu.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/jawugu.pdf
    • https://campusrec.princeton.edu/system/files/webform/93394875634.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/pitoripizebareko.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011308.bin
14e86727640e0cbce00a19d0c0fa77e8194c83e24c8377ecc8ec366f03472fc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 5352 bytes

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