Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a73ff41d6ab3574…

MALICIOUS

PDF

71.8 KB Created: 2021-04-05 00:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 879bc225b5be9732fdf3f2bf59bea22c SHA-1: e7931108ef9aeca61b30e89357fab11369001e20 SHA-256: 4a73ff41d6ab3574c322ebbe65168cbb44043114e098ea8b61fad22a6acb7ff5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document is designed to redirect users to external sites. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=civil+air+patrol+memorandum+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446512/normal_60491c4781fcf.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/Hhhzjh8/95509955830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_6006283f4e6d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382966/normal_5fe0f68fcfcb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_601d5c8be9ac6.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/hanfI0W/nuboxobukijukobaveruxoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fcdd93e6ea5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6019666633683.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/O7qKgiO/36876622140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fcc25a512c38.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/68253094215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fe7d9096f97b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/11386291248.pdfIn PDF document text
    • http://fuxobubuwuvivil.epizy.com/12_acuerdos_de_paz.pdfIn PDF document text
    • http://luzafofefo.rf.gd/9741592822.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/10952606542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0181dbd-ee50-4335-b119-68e00cd015d3/10218772444.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/what_is_the_atomic_mass_tell_you.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/grating_coupler_slab_waveguide.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/47409050069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ea7775-65ce-41f7-a436-a83d68b90809/can_i_make_a_strawberry_smoothie_with_milk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 4892 bytes
SHA-256: 1a444757098609262db51568fa2a6bd3f0bd851650d9f826cbbbfea3ebf2f09a
font_01_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 10216 bytes
SHA-256: 8fd6cd5c73902dba1955a996e03e1459e4336e253746907a938a459262564f53
font_02_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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