Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b9d8a16d20a665…

MALICIOUS

PDF

66.5 KB Created: 2021-02-08 09:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 47ae8f0ae148f30a278d73337e5a668f SHA-1: 77d6f2126910946776eb6fc106cae04eb83063d2 SHA-256: a4b9d8a16d20a665ecb19ebb2e828cd29590434eb0f51b6c1120d08f57fcaf1a
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wb?keyword=chuk%20charkha%20gali%20de%20vich%20song In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_600b4317e522c.pdfIn PDF document text
    • http://uscovidcharts.com/mathswatch_clip_205_grade_7_answerspdwvj.pdfIn PDF document text
    • http://psychologyrelax.xyz/49312113121ysleb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403127/normal_5ff95d98e681d.pdfIn PDF document text
    • https://gedofulijul.weebly.com/uploads/1/3/0/7/130775434/lotekorog-faporeval.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_601e300e571c5.pdfIn PDF document text
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/a9251.pdfIn PDF document text
    • http://copyright-rules-help.com/livukamejowarezage0945z.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/aff4d5.pdfIn PDF document text
    • http://shoop-fg.ru/25bzbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405206/normal_5ff2295224a27.pdfIn PDF document text
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/f25d967.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/fuwob-tufejuxeli.pdfIn PDF document text
    • http://curvepreloved.com/81547975332rzfvc.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/wiwuxot/icd_10_code_for_boutonniere_deformity.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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 5228 bytes
SHA-256: bcfa1ced71364e549f59cf7cf9c5a0fd779ecfdaa2a63e26a7220397ba016f0a
font_01_sfnt_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 13268 bytes
SHA-256: aad7a3dbb8b473e29716f468d9a3c11254e6e57dd492cb5ac8f09748096b0b95

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