Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b81dad69e76308…

MALICIOUS

PDF

67.2 KB Created: 2021-04-13 14:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91c075d7cbb7a4ad19580a86be44dc94 SHA-1: 69b6651061c8de227950455ba815941045e1d2bf SHA-256: c7b81dad69e76308ac8d5ef9a64ff3696718e789db19e2610d88db2b60802558
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to potentially malicious or link-farm sites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the detection results point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://www.osgeurope.com/sites/osg-corporate.dev/files/webform/povufukawonafano.pdf
    • https://www.dgs-interparts.be/sites/default/files/7838369457.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/keborezuvefubivuw.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/13349970620.pdf
    • https://www.jwico.com/sites/default/files/webform/koxajupenukolipidawikopi.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/powevalixerofewum.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/42282539280.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dekif.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/nunemoxajusadokuxilebe.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/37570077738.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/72664382884.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/dozigax.pdf
    • http://seiary.com/sites/default/files/webform/rec/wugibizipudaxejomite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=jesse+wolfson+math
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/17420147243.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf4c.bin
40816b0786e58822e2f5f0c7ecb04732781097ff753a08f25fe7d4603380ad2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4C 4732 bytes
font_01_sfnt_off0000cf3c.bin
0f9a3ecdbdeb33bc4f25337972a7e5455ca15e5a2549d13e1ee36bf84322bfd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 10180 bytes
font_02_sfnt_off0000f230.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 4324 bytes

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