Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fb6214a3316c8e…

MALICIOUS

PDF

69.3 KB Created: 2020-11-20 22:25:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd404c05a2ea85cbf4988846222c47b7 SHA-1: eca388f76be4f1072aa14af256ea4cf7e47b585c SHA-256: 89fb6214a3316c8e68ebb946d48fcf822ba024570a553ad39c429203888eb3b5
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics as malicious, including a high-severity rule indicating an image lure linking to an SEO redirector for phishing. The ML classifier and ClamAV also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to host or deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafftec.ru/123?utm_term=big+ideas+math+2+student+journal+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f888d726ccfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f9cf88a45776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5fa83f819ebf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5f9c6602987fc.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/fadobirak/geauga_county_auditor_realink.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/sisivesatajujenusu.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/34710878164.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/rivers_erosion_transportation_deposition_ks2_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/genaz.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/windows_8_activator-iso.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/12v_timer_delay.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_off0000d2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 5588 bytes
SHA-256: e447b965e4bd68961061da876180cca3413bc2ad0360203dc7f322053512306d
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10148 bytes
SHA-256: a52c6a7f975530ec17f02d9fc344a695a3fc4d85c78c44689613ecfc7fae361f

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