Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6609fe7289446b8…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 18:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c49367bb10e36e48f4b0de3b1e2e3e28 SHA-1: f285b0e2a61dcce0675214365ad5e5031dd4106b SHA-256: a6609fe7289446b8e17181cd10f45e392535a0d7895802a37cebc7a4b60ea82e
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of URLs like 'https://zajinet.ru/aws?utm_term=can+you+sue+a+court+for+negligence' strongly indicate a phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/aws?utm_term=can+you+sue+a+court+for+negligence
    • https://cdn.sqhk.co/fesoxuleri/jYgfAj2/77446438975.pdf
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/fenafirupisixi.pdf
    • http://internet-babki.ru/298809742030n6gw.pdf
    • http://dream-stat.ru/wopesozalikobol6ir1.pdf
    • https://sovawetozinunur.weebly.com/uploads/1/3/1/4/131407226/6030627.pdf
    • http://trikotoria.ru/nobibor7jr1y.pdf
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/6807141.pdf
    • https://cdn.sqhk.co/puranajav/aqggicW/jowavikumovudakox.pdf
    • https://cdn.sqhk.co/xovikojux/ihVhdja/17208401025.pdf
    • http://relodifalixogo.scienceontheweb.net/43407788428.pdf
    • http://meetlait.pro/how_do_i_calculate_the_margin_of_safety_percentager1r34.pdf
    • https://cdn.sqhk.co/gubujurit/Biigehd/nwsl_expansion_draft.pdf
    • http://larijasetejupaz.mypressonline.com/core_clinical_cases_for_medical_students.pdf
    • http://zukixulen.mypressonline.com/60312872072.pdf
    • https://sorafenime.weebly.com/uploads/1/3/4/3/134320910/ac9809.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jigotukaxeze.epizy.com/animal_name_list.pdf
    • http://zepibugab.rf.gd/matrimonial_case_information_statement_nj.pdf
    • http://kijaripejugap.epizy.com/putikajefuvodekavirig.pdf
    • http://rovobaf.epizy.com/brief_history_of_thailand.pdf
    • http://lobopekogolo.onlinewebshop.net/caso_clinico_de_cirrosis_hepatica_por_alcoholismo.pdf
    • http://dipulitexaxuz.epizy.com/web_application_security_assessment.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_off0000ee80.bin
ece163063ff66c6598f7644149bb1c146373a7411b459cebd2245472c84d88fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 5056 bytes
font_01_sfnt_off0000ffcb.bin
237b865156fb8002266c4cfda92500043007046437a372f27a3d2a4837eb9455		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 10692 bytes

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