Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6db89f6885db5c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-21 07:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 806d13be7a771409abbf83561c729d9e SHA-1: 2289e5c0587d99dff26133002c178187d1f671d0 SHA-256: 2b6db89f6885db5ca084f90a6d7c78e702c297d2e7aa94383991b6d3e89a62ae
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to 'xezojetit.ru'. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a cooldown message, suggesting a lure. The presence of multiple external links, including one flagged as a link farm, indicates a potential phishing or scam attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=you+have+entered+too+many+instances+recently+cooldown
    • https://cdn.sqhk.co/dagozuwemep/jbijght/41761214320.pdf
    • https://cdn.sqhk.co/livaxipovage/xgeoShg/zukipepuwonefurok.pdf
    • http://batemin.iblogger.org/xemifevugedabafu.pdf
    • http://puwobero.22web.org/55653860323.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_22d25eaa2a1d499b958da98db2a42338.pdf?index=true
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_53cd42e4ade04ad28a41a0757df32538.pdf?index=true
    • http://pewubik.atwebpages.com/guvezolose.pdf
    • http://zatuvejamubolo.atwebpages.com/agamemnon_by_aeschylus_download.pdf
    • https://s3.amazonaws.com/kudufigunabi/nefiburazevupafedi.pdf
    • https://s3.amazonaws.com/pegozegi/lituzivarobadud.pdf
    • http://dogurof.epizy.com/bowknot_platform_flat_sandals.pdf
    • https://s3.amazonaws.com/nuselufuzo/risk_register_dashboard_template_excel.pdf
    • https://s3.amazonaws.com/lijulijowivaze/worksheet_on_soluble_and_insoluble_substances.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/nizolofukasulikop.pdf
    • http://bozalusi.epizy.com/nisudaz.pdf
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_41d79a8b0c244502ad3245c97f740eb3.pdf?index=true
    • 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_off0000f866.bin
41967f09e43822db9215ab2f325c55aa636365f5c6cc5c268c97693fd1085252
pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 5392 bytes
font_01_sfnt_off00010aaf.bin
d471662552f80745cac62b9ad1b57d824f30d98f259027997d9b5818a81cd98b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 11556 bytes