Malicious PDF — malware analysis report

Static analysis result for SHA-256 8350c02267eb0c1c…

MALICIOUS

PDF

71.5 KB Created: 2021-02-14 09:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8ac5f49bf0a8dbf355004350d940ecd3 SHA-1: 8f10b2c0def7b29e988a61db690836d9b1c8971e SHA-256: 8350c02267eb0c1cbc2ef6c7bd5b906932429a42013de0e3310a79c1caf45837
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?utm_term=service+agreement+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489251/normal_601381385313d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_602529f14972e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fd3ce2fd7bdf.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/d2gjfPC/buttons_the_musical_dvd_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/xgfggdA/wedding_cakes_prices_and_pictures_in_durban.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/xibepuzizavepe-rogebaseforok-dejufej-woxafomoman.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5fe54d16c309a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fe5033386ff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fe2d818a0c08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_60054540661b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374517/normal_6006a7a838372.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_600638f39d568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_60026fc4dd3fe.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/zisalirivagigebunasodigaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495696/normal_5fcb1e7869629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 5460 bytes
SHA-256: 03daa1633d3b73b3ceddbd150c4181f0889f8491952ba1cd6614e3e885585949
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10336 bytes
SHA-256: 7868fdcd51bdb7ab6c39a92b9d5869ccdb7b4ead26fc9f6440ba83ca65d9b596

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