Malicious PDF — malware analysis report

Static analysis result for SHA-256 663581d4264ebddc…

MALICIOUS

PDF

71.8 KB Created: 2021-02-21 08:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 9a6ed8dcb52065d4d95065dc064a7b5d SHA-1: 949d6d9d99b3d0c67cd15127b13e95aa2e891a66 SHA-256: 663581d4264ebddc00670b15e03341c469d3ed6135de0ffc6ea0361777b9d108
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://baarspo.ru/wix?keyword=thunderbird+infinite+campus+login.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=thunderbird+infinite+campus+login PDF link annotation
    • https://cdn.sqhk.co/birenejar/Kjjxhe0/59792550212.pdfIn PDF document text
    • https://cdn.sqhk.co/vakamuzawa/kjifgeK/48572529852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fda52397da0a.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/cn2iahc/duladolojujel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485704/normal_600389adc1ac7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377125/normal_5fe24263e791e.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/mhiTgi1/disaster_skins_for_roblox_without_robux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_60065ecbbbfa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474723/normal_601ba1e2c9806.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/e0Aid2R/kefilumejogimaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_602a89a9ad58c.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/napejaxosinages/3285470125.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/btd6_true_sun_god_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/govijar.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/14244074684.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/13338635943.pdfIn PDF document text
    • https://www.guhsdaz.org/parents__students/parent_v_u_eIn 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_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 5660 bytes
SHA-256: 1f7e5c9b804759aecef396c85fb07588430e863ae29a25630d8270b8c1e646d2
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10808 bytes
SHA-256: fdaa9d0c685268a63c68a48d250d18b1797136b3416d16f7c9560282f0a2601c

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