Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d43a5f104ed5643…

MALICIOUS

PDF

72.7 KB Created: 2021-05-21 14:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e58273bd4580b2705b89a658b84c35af SHA-1: ca245b152ba49ada9cdc9b8114d10cd3ceb41b31 SHA-256: 7d43a5f104ed56436ec10b5878447568859097c5db03c4e889784f31b4399554
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 heuristics indicating it's a phishing lure, specifically using a redirector link related to game cheats. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL points to a suspicious domain, likely serving as a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=dragons+rise+of+berk+unlimited+runes+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401989/normal_603f6ea403150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_606675c6c1faa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376357/normal_5ffb3d052adb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_601b1a5d82642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_6066fbfc4cf59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5fe9555933047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454304/normal_6023b92655fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_606294ab74c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_603d924315e6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5fc956500e207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_601321b212b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6067d560de305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fcd81713ad02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fe4dc35a2e66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_60665a1f71c13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496001/normal_5febf035e93a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fc772ae017af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be975273-b8ae-45ad-80ad-6d53f10ad5fc/tuxojazesurafevebuketaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee98851-fce2-411e-aaac-23142f2b2d1c/ikea_malm_black-brown_queen_size_bed_frame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c24124-61ef-4c40-a8bc-5d9dd808de55/84325074986.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 4

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_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 5432 bytes
SHA-256: fc6504893cd20a9914bf07101d6321ee924e2027b6f59837a22fc9cd5925aded
font_01_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 20676 bytes
SHA-256: f90e251c98cd46e7e6f668e4e8355ed709dfbfecc9162bb07eaba57d37dc5a4b

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