Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6dfdeddc433247…

MALICIOUS

PDF

79.7 KB Created: 2021-03-14 03:54:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6850e49c903cf4b8e35b8da55dc154c SHA-1: 2d25f677c080105e7ac0334eb8be17cdbd6b0a01 SHA-256: da6dfdeddc43324728e14c38dd57d7744bc9131f5d09a4242734569928570bd1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing campaign. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://vilenefex.ru/wix?keyword=note+taking+worksheet+introduction+to+animals
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/gujuw-pimepaxevi-midalagaki.pdf
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/losevina.pdf
    • http://nejevefivi.mypressonline.com/79727604487.pdf
    • http://tenipimutav.mywebcommunity.org/all_the_things_you_are_charlie_parker.pdf
    • http://jofufunobek.sportsontheweb.net/31553488872.pdf
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/484d9f9b727.pdf
    • http://tijudiwulewanuw.getenjoyment.net/miguxova.pdf
    • https://cdn.sqhk.co/nakolore/uhegh6r/fadunap.pdf
    • http://zunuruxeguxifi.mygamesonline.org/30785481331.pdf
    • http://wivupivipewezap.mygamesonline.org/49020901505.pdf
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/2190366.pdf
    • https://cdn.sqhk.co/dafagupovo/xzjcljb/gas_properties_simulation_activity_worksheet_answers.pdf
    • http://tasiperop.medianewsonline.com/55940779281.pdf
    • https://cdn.sqhk.co/mujawiru/dNtggc4/19217167132.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_95cbdfb497c34852a10c2f4af2d7a628.pdf?index=true
    • http://solarujarinobo.myartsonline.com/34793233163.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_54f88ccedf014615985cb5e1e9b2d1cb.pdf?index=true
    • https://c650af5e-0282-4af0-b463-5257f42ab309.filesusr.com/ugd/89b1bc_b1d98f7879d6451da10be57f09bfaa94.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fc.bin
7ffb3d1dc6db6415e565dba1bc2e105858561800653b74ca420a61f4033f2791		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 5476 bytes
font_01_sfnt_off00010a8a.bin
3546b10643ce938f3cc31ef1c5e73cfea06dcc03c26731ebd319198c697b9976		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 11548 bytes

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