Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6624bb5e72fb45…

MALICIOUS

PDF

85.2 KB Created: 2021-03-11 11:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1723d7dac8216dc4b2b28b86e8fdd706 SHA-1: a101ea7cbb97b4f7f69c8ea632d0af8a2e4a8c1f SHA-256: cb6624bb5e72fb4590e5553c1d357f7fc90a2b0367cb771ec7e1ed1bd5dc8252
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=benefits+of+budgetary+control+pdf PDF link annotation
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/zuzatawip.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/jjshih9/rechargeable_lighter_target.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/sythe73/melozokexasolaj.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/mowipufidulogu.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/hJgdCiy/digital_recorder_maricopa_county.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/damuxusapumawemov.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/xujolizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_5fd3330685509.pdfIn PDF document text
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/gasal_zipadog.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/fhhZmMf/umc_el_paso_ysleta_clinic.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/ebab24bb47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5fca95f372969.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/n3Rjfhc/amazon_go_store_locations_uk.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/xetojowuna_rijowuke_giluzapagevepu.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/bce8a086b9c4.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/jkjgjca/vumuvudowe.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/c6659ddec545c5.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/ihG69PV/10187796788.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_c325d427779a460dbe6c0d3d7453b607.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_63c76599b3c2433682aedc05bb370a03.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_4b84650633a948e1abce473a1fafda3f.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_a80cc6d3ee8f45b2a4d747a94fcce032.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_off00010fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE3 5612 bytes
SHA-256: cbf8865bf3240464d4c43de0c50b89169efa9fa51cce0bed7dcd02767d0068cd
font_01_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 10688 bytes
SHA-256: 0850419b710b5b19b77c24569e9c0b32b94c671acc87cd0bd84354ef3f4994d4