Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb91921eba41a1da…

MALICIOUS

PDF

73.2 KB Created: 2021-02-16 21:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8f6f706e2cba7d3b69fd6132df42f434 SHA-1: 89d33d5ba46ffda14a8c957ad8cebd7c4a9f1adc SHA-256: cb91921eba41a1dab4447b9c7bfc9ef620ae34d57105c1f64aec8acd88bb93c7
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/wix?keyword=8+ball+pool+hack+no+survey+no+human+verification+100+working PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5fc68b95537ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454436/normal_6004580c43cfb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5fdfd794a2034.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/3a8fff175b149a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_6007d79e3aae2.pdfIn PDF document text
    • https://tizizuner.weebly.com/uploads/1/3/1/8/131872037/rarofotifota-xorosuxidexufu-rurax-zemede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ff895310e444.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/muvibumudubelog_rufadogevidul.pdfIn PDF document text
    • https://tekitoloveda.weebly.com/uploads/1/3/1/0/131070611/3074693.pdfIn PDF document text
    • https://lakiliwurig.weebly.com/uploads/1/3/6/0/136089988/a2b2cd6186cbeb.pdfIn PDF document text
    • https://tenimuleletef.weebly.com/uploads/1/3/4/3/134343202/2436527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_5fe2927249819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_600b3c32b35df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_6016fb29d1991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_601194f6dce0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444353/normal_5ff459649f730.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366044/normal_5fc7cf7b67571.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/lojuvewifel.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/womirofop/jatev.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/assassin_s_creed_identity_apk_latest.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/54845089227.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/85359505388.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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 6180 bytes
SHA-256: 9c8795e281bbff2e9689bff61631ecfd31c33049da5c1a408df30ff77893620a
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 11028 bytes
SHA-256: 9ef9699b0a3e531d12cd1b4186249ae4e59d5a7c37e63d8ddce63c78c021f539