Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34cfa69924e6483…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 21:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 679b74175d1ef7d4a29509265280fb1b SHA-1: 57efd12eed2247fc41281f26fbad7f9d5f71fa96 SHA-256: f34cfa69924e6483dbb3a054f51050da530dcac7ebfc198219999da5c62b5f56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/award?keyword=adjectives+ending+in+y+pdf PDF link annotation
    • http://sobebal.22web.org/11540653914.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/hfAQKjb/93456976070.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/gib2biy/8804952658.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/heomFiA/55557097382.pdfIn PDF document text
    • http://ruzazeruduzelu.22web.org/89545816602.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/76633155706.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_514005d72813478f879afd52421909d1.pdf?index=trueIn PDF document text
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_e47b944c87ed48cbac74996734d1af82.pdf?index=trueIn PDF document text
    • http://gisuvax.epizy.com/jabariya_jodi_movie_hdmp4mania.pdfIn PDF document text
    • http://rowomasogig.epizy.com/82355038043.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_01155fe2862b461c87b4f94ba80d1876.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_4cbd6dec894e48d097e1af0485374fd8.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/what_to_know_before_buying_a_small_business.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_b8eb9d19551f4e3d85e4b8adbb7b3d4a.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_4457837954a84a98a4b9eff0d9718337.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_f517ebb90c0443cc95e96b78fbbc2167.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_af0d7b90534e47ca96be4fc3969b8858.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_ef8d89d57ecb48c18e0232fed8546b3c.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 5212 bytes
SHA-256: e0ae88ca4ddd6d298c8c71badcdc2cbf53d2dbe48c1e0535dae3896ca0c9eb3d
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 10728 bytes
SHA-256: 6515320b0567e28ee0043c02207738b4a0fef91be5a4afe628ccb52b35c7767f

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