Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dcb7174eb4c3c7…

MALICIOUS

PDF

71.8 KB Created: 2021-02-14 13:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: ffa178c8a164dc737d1a5db110942987 SHA-1: c0be2c9f401083f42200073f9230fc8ea50f5f78 SHA-256: 85dcb7174eb4c3c7bfa8e62c732fed743035d49e9548ddbbe45ca7a781a27217
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=basketball+jam+mod+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_601dd5ecc6b3d.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/CChbhiA/83098792259.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/jeo89jh/torolufitop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5feb26d2956da.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/hE2hbVc/central_texas_umc_jobs.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/tv_guide_cairns_post7ylmf.pdfIn PDF document text
    • http://zathkatow.xyz/binilikiburawowem06rv.pdfIn PDF document text
    • http://furniture21.online/weather_radar_near_me_tampaewgg4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389585/normal_5fcc82179e6af.pdfIn PDF document text
    • https://radifepibonavu.weebly.com/uploads/1/3/2/7/132712096/3097742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lorerexeg/bafus.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/2019_afl_fixture.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/20116729327.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/feduv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 4972 bytes
SHA-256: 256e014f40dbca98f2bfa7732d7b9be697d5658db277da227c408e2c4e8d07bb
font_01_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 10868 bytes
SHA-256: f64373015d322e8e46a411be620a3b94c7d8591827ce3353ce8c6e23b1d23bf0
font_02_sfnt_off00010489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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