Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bac73273ceea46…

MALICIOUS

PDF

76.0 KB Created: 2021-02-10 09:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4c8177b5b63279aa5f2e70a52ed69bb5 SHA-1: 85e1fb0a0373db361f59eedef2e1b640a5fa7a64 SHA-256: 67bac73273ceea46f4ae55d7a6684772a887ef8e825eb4d460da9ad22c7c39b3
196 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
  • 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://baarspo.ru/wb?keyword=gynecologic%20oncology%20case%20reports%20journal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476416/normal_5fe0b5f24ab9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469643/normal_5ff22b7b41332.pdfIn PDF document text
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/fetil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe51178d7a1a.pdfIn PDF document text
    • https://xazepobuzu.weebly.com/uploads/1/3/4/5/134582826/8163391.pdfIn PDF document text
    • http://sojuvofud.22web.org/abirami_anthathi_ringtone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fdc89d577249.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/dejolavubukugeb/xabifuxogo.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/factoring_by_greatest_common_factor_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/billionaire_new_song_video.pdfIn PDF document text
    • http://lokokojorivumi.rf.gd/break_even_point_excel_formel.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/9071812327.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/togogetilopupeze.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/dugufelot.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/95226082475.pdfIn PDF document text
    • https://doi.orgIn 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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5308 bytes
SHA-256: d37a2d7b718336f92401a563bf87b4a6b703616e89dafa7a7c2ee254be95adc9
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 10692 bytes
SHA-256: 233293b8a6dbd9d26b3e27dd87dff4dcaf17669716f74608bb1963cd694cb78e