Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9847bb6ac4375b7…

MALICIOUS

PDF

77.8 KB Created: 2021-02-04 00:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 4647643779b2031b519745bbf4ecceb2 SHA-1: 925cc231dda1403aacd777224e42905fe2970466 SHA-256: f9847bb6ac4375b7eba1d3abeab89dca41fac365cdc42a497915986061dbab19
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://druttle.ru/123?utm_term=capitulo+3a+answers+page+51 PDF link annotation
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/vekeronutuzon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_600e5a119b1c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471513/normal_5fdc9a2490237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_60176c2c2dd5e.pdfIn PDF document text
    • https://zetidepip.weebly.com/uploads/1/3/4/4/134432407/jarobupumikevixolox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366343/normal_5fe01a3f47a6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_600563c484f45.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/DWgigcC/zepebanerisi.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelotosa/tjeAQhg/call_of_war_1942_victory_points.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_6011a8f48c968.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493200/normal_5fe13ed31f1e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bakotege.rf.gd/zeranavawopejosudez.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/98249488965.pdfIn PDF document text
    • http://zorogeloma.epizy.com/missing_number_worksheets_for_first_grade.pdfIn PDF document text
    • http://fepirag.epizy.com/paboxikilokeziv.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_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5324 bytes
SHA-256: 4b386347466f78f166bdd9b82ce9b905f1369e7c788b9557a88d8017cf727831
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 13732 bytes
SHA-256: c629a4bc1b4bfebac998dd1709cb3174014ff0afff10b051905635560e83994e