Malicious PDF — malware analysis report

Static analysis result for SHA-256 599d8ab63725f1aa…

MALICIOUS

PDF

79.6 KB Created: 2021-02-13 16:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0a25afb07c0c2c20cb150dcd8d5d08ea SHA-1: 248fc3f988c0875ed7d423d5a504a96c7db96166 SHA-256: 599d8ab63725f1aad42a970c5cf41b4929a00c26dc0941f7e7566cb3e69de8bc
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or ad fraud. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/123?utm_term=extreme+dog+fence+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391340/normal_6009f4be3b566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464080/normal_5ffcb7a95be1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5ff534ad6351d.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/1283178.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/1284955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_6011b63ba1f7a.pdfIn PDF document text
    • https://zusonuxegaza.weebly.com/uploads/1/3/1/4/131437774/datirabedebimitut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_601cb77f0586c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5fdc5a93ee6a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fe398a055d6a.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/bekatadowibepakudoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5fcdd1c844871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zetakid.rf.gd/optimization_of_phenol-_chloroform_rna_extraction.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/honda_accord_2019_owners_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 5188 bytes
SHA-256: b3a7ecd7bd7e9270c3f0631bc3f9efd5d65adda594e8b8568e7da43224bcd90b
font_01_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 1796 bytes
SHA-256: cb8590c91ef0f476e7f1000773a946dcb994e2f585eaea197fe865e273b6dea6
font_02_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10684 bytes
SHA-256: 8048aa82bc74a86439ac0c4b9a1c1c5f834fa15aa783d7f1ed55a45c88b86a2b
font_03_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

Open this report in the interactive analyzer, or submit your own file for analysis.