Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58731c667e8b5e6…

MALICIOUS

PDF

79.0 KB Created: 2021-02-22 00:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cc1eb1ff1ec6d22c95a67796ab5dd9b2 SHA-1: 4914840b64e8408b99f471e7e01685984d41a39f SHA-256: d58731c667e8b5e683804cf0a0ce4b432ddab6abf9c6fd3e37be5135761eef87
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the document's structure point towards an attempt to exploit users searching for specific technical documents, likely as a lure for further malicious activity.

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
  • 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.
  • 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://bologen.ru/wb?keyword=iso%2022000%20haccp%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384048/normal_601f0619796b9.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/hidghjr/jumitelidokipijakexixu.pdfIn PDF document text
    • https://giwulotasika.weebly.com/uploads/1/3/1/4/131411199/dfd28d27b068.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/g7Ou2hj/7640988038.pdfIn PDF document text
    • https://relazubaw.weebly.com/uploads/1/3/5/3/135315829/1569827.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/cdf8371e8602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_602601ef4ae7c.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/xujirarefagar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476274/normal_5ffe0b579046f.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/worif-powewenivut-wurutirojafeva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5ffba665e4e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600dcf1760adb.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/vazabekujilanif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_60191266045f6.pdfIn PDF document text
    • https://dodonixufaf.weebly.com/uploads/1/3/1/4/131453867/negutapugagidat_kodamuweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_6028222cc05bf.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/viwafi.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/2735926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 4760 bytes
SHA-256: 62d1d9e8cbc30d61d03b1bb12598c5ae8373301429b48a805307085f17b06b84
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 12952 bytes
SHA-256: de07c2e7d1e059665467d55a262dbae98b3f43c94c39aa96c954314d8846f177
font_02_sfnt_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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