Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d9559870848e40…

MALICIOUS

PDF

68.0 KB Created: 2021-01-08 17:27:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f58be54b0ab89d3254c8ada1a850ffc6 SHA-1: e724c7299d4405a9272063e873e491ba60ed8120 SHA-256: 87d9559870848e4047c17b983ef324d7b695d606f53a99030b9f9b622f95df99
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 an embedded URL that redirects to a suspicious domain, identified as a phishing lure for a game trainer. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to trick users into downloading further malware.

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
  • 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://trafffi.ru/aws?utm_term=stalker+shadow+of+chernobyl+trainer+1.+0004 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4428043/normal_5fc9ef8c3f435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f9c03172aa34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5fe61063280fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478947/normal_5fad912a29bba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5fbf6181a33e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fc462257fd2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fc4d64185b16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5fc0cd00760be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_5fd852cca17d7.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/paxuvagal/personal_lubricant_sample_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a19e517c-3947-48b0-a9a7-c0d7f8cd8944/asa_5525-_x_adaptive_security_appliance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b8c004-df59-4aa6-98f8-a4c01c554cd7/61154464668.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/fighter_plane_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d161dc-78d0-45e5-afef-fff711cf9021/sepum.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 5924 bytes
SHA-256: c7140931f62f5d7deb2f6b049b1926a0d3236c4a690b514e100274179a53c851
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 11692 bytes
SHA-256: 4977fe7358db4f8a913fe82a8a1e4a139cdb150ae5e571bfe25777b16fd56629

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