Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db9c536f28a119d…

MALICIOUS

PDF

64.0 KB Created: 2021-04-11 15:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5da9dc0d6c514786e7912732dc41967a SHA-1: 4c02ac30ff95c5633f9703500ddf9ee247b351e6 SHA-256: 4db9c536f28a119dcf51a266b07b2afc283411cea45e9d43e09a478a3f006786
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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.enwidth.com/sites/default/files/webform/resumes/58607877977.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/31626011693.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/7486912807.pdf
    • https://www.termis.org/system/files/webform/manejuwavujegajejumoxak.pdf
    • http://spotlight-sites.com/sites/default/files/webform/44923699615.pdf
    • https://www.dgs-interparts.be/sites/default/files/57515461030.pdf
    • https://www.a1touchsolution.nl/sites/default/files/56489371510.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=jdm+subaru+sti+parts
    • https://drones.princeton.edu/system/files/webform/61493424170.pdf
    • https://printandmail.princeton.edu/system/files/webform/42849177422.pdf
    • https://umatter.princeton.edu/system/files/webform/requests/tutoturabawukaxubudevodor.pdf
    • https://gradfutures.princeton.edu/system/files/webform/pelafo.pdf
    • https://community.princeton.edu/system/files/webform/luzixuganigofifabeja.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc5a.bin
db2923c4dd78d92e458ab04ff98bb42f3c48f04dc8e981f11f5592798e2e43dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 5200 bytes
font_01_sfnt_off0000dde4.bin
8c3ae470bd7a2e17a9fc8209092e6c9a4b14f8355b980828ed1b006374746c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 9816 bytes

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