Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca2fe7984cb5239…

MALICIOUS

PDF

78.8 KB Created: 2021-04-16 11:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 46f0992284173e6aea86fdc1c5a8837e SHA-1: 26550cad18103b5f4bd28b58ade1aff1c4716d8f SHA-256: 4ca2fe7984cb5239009cac1255bdbfbf80f6f9e9814f86bd66e70fea1926b046
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a large number of external links, many pointing to PDF files, suggesting a link farm for SEO manipulation. One of the primary URLs, 'https://baarspo.ru/strik?utm_term=what+density+of+crude+palm+oil', is directly embedded and likely serves as the initial lure. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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 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.
  • 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://baarspo.ru/strik?utm_term=what+density+of+crude+palm+oil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463809/normal_6010546544273.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/rimotawimala.pdfIn PDF document text
    • http://wutugidejavazu.scienceontheweb.net/cardiologia_intervencionista.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/94610024768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_6047704a9766e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60225c915c692.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/39aa9f43927.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/towakog/jutupizobe.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/22297180560.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/merafaraxukevuwitiwake.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/86089990365.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/bewefogitiboruvu.pdfIn PDF document text
    • https://acbe2b0b-ee64-4eea-b0ce-372b1aa9cc7a.filesusr.com/ugd/4bcc67_9c0c502272ee4062b92471a52e104c23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewiro/cai_dat_driver_may_in_brother_hl_2240d.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_f787bf2ba8e248d4b2fceb41e7b9be71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/lynch_syndrome_screening_guidelines_nccn.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/innocent_witness_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/gexegevojolemozeramotex.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 5508 bytes
SHA-256: 39c9286875c88e0605a2a722a608b4c128ad2a7be8d068ca60ede91bebbc5366
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 11344 bytes
SHA-256: 30228883da7b088a6c85cef938bcdaeeb95661d01ddd2aa820464544aafe196d

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