Malicious PDF — malware analysis report

Static analysis result for SHA-256 d134dec832384c39…

MALICIOUS

PDF

71.8 KB Created: 2021-03-21 04:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06bf275dd7497b17ebdf39cc0b85c88a SHA-1: 481a58f8c1bda010073cae7567707c09866d583a SHA-256: d134dec832384c39018c0277cd86c55790b1585cb5c8fc925a30c18ff1dbc45e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://lozipotod.ru/award?keyword=administraci%25C3%25B3n+de+empresas+constructoras+2a+ed+pdf
    • https://bokefelefu.weebly.com/uploads/1/3/1/3/131383825/8657964.pdf
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/jofiboxerib.pdf
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/9753454.pdf
    • http://suzofovolavuk.scienceontheweb.net/bopugizujezafinivib.pdf
    • http://bumumapa.mypressonline.com/togobujotefovupuvaket.pdf
    • http://pugisapi.mypressonline.com/gixijokadekoboz.pdf
    • http://fametasubub.22web.org/66559687158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_11dcf6a4d3d94730b98d61b3f0515e91.pdf?index=true
    • https://s3.amazonaws.com/vitelitubovuluj/yamaha_aventage_rx-a730_specs.pdf
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_08da2025cf574a3285e5f0acc125b984.pdf?index=true
    • https://s3.amazonaws.com/papuja/lolobiwipi.pdf
    • https://s3.amazonaws.com/kulinisokakewi/24521520573.pdf
    • https://s3.amazonaws.com/kabisebax/tesco_questionnaire_answers_crumpets.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_91b077d7ab6d451c8e438d27ae3ed0fd.pdf?index=true
    • https://s3.amazonaws.com/ladiwuzetawedi/tabanolefa.pdf
    • https://s3.amazonaws.com/jopomodilamego/zewewupirodusod.pdf
    • https://s3.amazonaws.com/kavifunaruvi/12293921131.pdf
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_ddf453e88fd244f384af0dc9a966cd79.pdf?index=true
    • http://ruwozubusa.epizy.com/mubenib.pdf
    • 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_off0000d684.bin
ed6c848f1117ed75eab61bd0ea95e9012052461f19ac935e899d431754d09ad0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 5528 bytes
font_01_sfnt_off0000e8fb.bin
90ec52cacb10c91dce9075fa0fa0db507123ad44759e4262187728f689e8d376		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 12060 bytes

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