Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d0a1c2519b02b9…

MALICIOUS

PDF

67.4 KB Created: 2021-02-22 10:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9f31bea026930f2db8a8534b042ee319 SHA-1: e0d61de8f572a3b9cd7fd72bfaba0cc86ac8eb16 SHA-256: e7d0a1c2519b02b94360dffea3bd76d2acae071cbca1478a2f90d69ddd4f9799
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-confidence ML detection and a ClamAV signature indicating it is a phishing or trojan. The embedded URL and document body suggest a lure for free downloads, likely to trick users into downloading malware. No scripts were extracted, but the PDF structure itself is used to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=bullet+for+my+valentine+bittersweet+memories+mp3+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407316/normal_6022842482f97.pdfIn PDF document text
    • https://cdn.sqhk.co/bexikerez/1hcjdjf/weather_station_safe_key.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ihdjjbN/operations_management_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/eicWie1/identity_v_danganronpa_2.pdfIn PDF document text
    • https://cdn.sqhk.co/segidexu/gzjg8je/75833182128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5fdddbdbd9ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_6018f8c4839a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_60298928d0d9b.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/jgkjdAk/favonexokiwoba.pdfIn PDF document text
    • http://help-service-support.com/64515921966z07p.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/ShbheCC/tovurisosanobiravijufines.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/pRhjzgg/gulunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_5fda5f271999c.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_off0000c83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83B 5792 bytes
SHA-256: d7fe045641ce1ea1f9f4755397ad3ae8a9f0549f842581bca223cb28693ee997
font_01_sfnt_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 10700 bytes
SHA-256: a58a8dc508c7ad952501eca9f2eeda80df25f0ca5d1e53116e9cb7d22f275106

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