Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad4a99c776b100e…

MALICIOUS

PDF

70.6 KB Created: 2021-03-06 22:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 68728efa4a123da26ff08da2b74a0397 SHA-1: a1cacfe4db04d44c5f2b817302cef7be770642a6 SHA-256: 8ad4a99c776b100e7e0fbe3c696fa20d9d25f708bee1751feb4186daec50c48e
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/wix?keyword=bus+pictures+cartoon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366949/normal_6003d2514a74c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6018212c906ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5ff4f27f2272f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_60254ebad8abd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ffe0913ce517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382773/normal_5ffef1b7e4aa5.pdfIn PDF document text
    • https://revogofoti.weebly.com/uploads/1/3/3/9/133999152/09bb6850d7a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416664/normal_5ff65ba696bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5fd9f9ff97023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_6024b74e1ea1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fcea6c6441df.pdfIn PDF document text
    • https://pazuvokase.weebly.com/uploads/1/3/4/6/134615635/vewejexawirubi-muzegodenolelok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ff069c510418.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5fd03be4e7357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fd66f8d189de.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/jemazejodep/lotus_evora_buying_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/surixumugunujuzuvizi.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/the_git_up_dance_step_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/los_verbos_irregulares_en_ingles_presente_pasado_y_futuro.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/zupawomazoposa.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/tawodetotataxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/35030946769.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/florida_driver_s_permit_study_guide_free.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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 4944 bytes
SHA-256: 650a88d7b6076656079182495853bc0d605a44b5636b0fda3efdd5e0d345c090
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10108 bytes
SHA-256: 232b2dac92198660d3c7b03b7448496f6c92edb9dbca69c3a37dcb3c1cf04b07

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