Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f229c3b120a2838…

MALICIOUS

PDF

80.5 KB Created: 2021-03-15 12:13:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9b30566d00cc479b311d6bd32ad4584 SHA-1: 7a62a43ac702464ada86af4b6a03a3d5b078db82 SHA-256: 8f229c3b120a28385bdb1071e6b54e0f85887a6890543ad9b1f872599906217a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of embedded external links, suggesting a link farm or phishing attempt. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links, likely to direct users to malicious websites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=ergonomics+in+computer+pdf
    • https://cdn.sqhk.co/navotezive/GdMiahd/among_us_free_gameplay.pdf
    • https://cdn.sqhk.co/tufuboloruj/iehfUjd/competition_plus_tv.pdf
    • http://br1.red/7575869729381q3m.pdf
    • http://reduslim-italia.website/how_to_remove_dome_from_hearing_aidwcl5k.pdf
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/05ee23.pdf
    • https://ruzudagozigiwis.weebly.com/uploads/1/3/5/3/135394236/jagoluto_nitivubotuvum_gisixob_weruxitonobifim.pdf
    • http://faceit.su/sewatipejemezaserosejufs48qu.pdf
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/115c9909b774c.pdf
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/radimefo.pdf
    • http://vorasim.iblogger.org/28875801280.pdf
    • https://cdn.sqhk.co/zatejurix/hgjipvm/70546808267.pdf
    • https://fivixevovisobav.weebly.com/uploads/1/3/1/3/131380347/zagiruzemu_zigopumi.pdf
    • http://palejep.22web.org/sticker_maker_for_whatsapp_ios.pdf
    • https://cdn.sqhk.co/jaruxabal/hghjfhb/87344070455.pdf
    • http://mosedapovetode.22web.org/totaxezomobugenu.pdf
    • https://cdn.sqhk.co/bofagenined/fhj526j/gonafiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_55fef29308364e7e9331f96e05b25199.pdf?index=true
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_0bd126fe2e8b44329b1b62b48ede6adc.pdf?index=true
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_07ba8cd6d9b440e08e53baa0c968e447.pdf?index=true
    • http://zaximibirada.epizy.com/bafevega.pdf
    • http://vipifusofired.epizy.com/gipuwe.pdf
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_cbb48b3f137145a6996ac680984b59cd.pdf?index=true
    • https://medlineplus.gov/ergonomics.html
    • 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_off0000ff81.bin
fc3517556d47b6aea85c5514175870eafa0e32df90d516913d12a527752f3187		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 5192 bytes
font_01_sfnt_off00011124.bin
a2ff4af64c5eb1bebb637d2d82c48ff4a373fd741f4938234072c8def50b92a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 10476 bytes

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