Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7709899665c3a5c…

MALICIOUS

PDF

64.0 KB Created: 2021-04-07 02:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d80d039b41ee49947efeccf1be74575 SHA-1: f8dd5b20caa83bf79786ffff06c1f4543cd6862e SHA-256: a7709899665c3a5c49e487d0df9f65155d20f733edc17559f79a8967c9940a37
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to distribute malicious content, as flagged by ML and ClamAV. The document body, though heavily obfuscated, suggests a lure related to 'Ayatul kursi pdf printable'. The presence of numerous external URIs, many pointing to potentially compromised legitimate domains, supports the attack pattern of distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9292

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.woonsocketri.org/system/temporary/webform/makepepatamizozixijefawop.pdf
    • https://www.dgs-interparts.be/sites/default/files/viwiredozilopuvotudulufez.pdf
    • https://www.uts.cw/sites/default/files/webform/58994315224.pdf
    • https://www.jwico.com/sites/default/files/webform/minokoniniwige.pdf
    • https://aboss.by/sites/default/files/webform/vobefoxejajizagosoberob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ayatul+kursi+pdf+printable
    • https://thesanfordschool.asu.edu/sites/default/files/webform/31460711967.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/60395266702.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/87767597376.pdf
    • https://lib.asu.edu/system/files/webform/bejugejotofetuxiw.pdf
    • https://www.healthdata.org/sites/default/files/resumes/mavesoriv.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c820.bin
87709e8cb7f50225b527652599e6fdbfb73a1eff7b65e4028172c65054962813		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 5332 bytes
font_01_sfnt_off0000da5a.bin
c319a72730d03c07ef430458eb279798b52025764f5888004d026a9393510e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 10656 bytes

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