Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef92079ef310a45b…

MALICIOUS

PDF

68.4 KB Created: 2021-02-10 22:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: d5ccdb79f482c7c5e6379aad4877bdc9 SHA-1: 1982b56fe61d3ee0a355020da0b98f7482f1a46d SHA-256: ef92079ef310a45b0d87b5f50beceb36f2aa72bc1bfccc0a6c9cf53db1743258
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://yafferge.ru/123?utm_term=what+will+mealworms+eat In PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_60098d7d6e18a.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/gmihifj/xijivawogarino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ff880792e76d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496810/normal_60187f5927794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_600ed755e3495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412415/normal_6012a4691efc7.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/giciiY0/dupixun.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/F5gihbg/betijodevobonopuborotu.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/jdghigO/piliruzokopixizoxavevuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/xazakamugi/ctgjsif/archery_king_mod_apk_online.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jgiakaz/28062419246.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/matogapibelifiv/wopiravemidalojafowoxofij.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/78274257473.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/excel_spreadsheet_for_expenses_tracking.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/cpr_guidelines_2018.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_off0000d0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BA 5028 bytes
SHA-256: 76efef0c3eed5e2c8d00aa887fe323be1d040416a0f464cc7b9736a4fbc7e916
font_01_sfnt_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 10404 bytes
SHA-256: f0f9880fd249b800851f069c5d3b1dd69892230e42a6b05235f926eacf0fdc73