Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c828a2c190df1e3…

MALICIOUS

PDF

38.8 KB Created: 2020-07-07 11:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd48faa8ae41a192b06b4846a528749a SHA-1: a9555e13688df82ffff0379486cf35136f89778f SHA-256: 0c828a2c190df1e3b2f33680220fe6e5bdfc36c366fa86b528dcea4d73a3299e
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files, suggesting a link farm or redirection mechanism for malware distribution. The presence of embedded URLs and the heuristic firing 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly suggest that the document is designed to redirect users to malicious sites, potentially for phishing or to download further payloads. The document body, though partially corrupted, contains text related to a 'Vauxhall vivaro parts manual', which serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Dropper.Agent-9096395-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9096395-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.com/wb?keyword=vauxhall%20vivaro%20parts%20manual#vauxhall+vivaro+parts+manual
    • http://files.sitesofpassage.org/uploads/1/3/1/0/131071240/455213.pdf
    • http://files.womenartistsreaction.com/uploads/1/3/2/3/132302863/8d22be5d98d153.pdf
    • http://files.poleshiftnews.com/uploads/1/3/2/8/132815961/493882.pdf
    • http://files.saikmusic.org/uploads/1/3/2/7/132740415/67c8893d65fe7.pdf
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdf
    • http://files.nxtgenerationenergy.com/uploads/1/3/2/7/132740415/sodegebu.pdf
    • http://files.hickmanfootball.com/uploads/1/3/0/7/130776788/kamubumul-dobozokowobiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ragogudulamu.files.wordpress.com/2020/06/95949918441.pdf
    • https://sizegojabu159328003.files.wordpress.com/2020/06/62348415939.pdf
    • https://jumitedav.files.wordpress.com/2020/06/40380380227.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b9f.bin
f7f00cd564cbb974fa1389515e9bff3ff68014c9919faf1f93c668822985c11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9F 4916 bytes
font_01_sfnt_off00006c28.bin
12073702bf9a6deb771d00571648690d4122fddc952e1b0cf304d3227d7f4817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C28 10148 bytes

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