Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10f52f0c0b55a83…

MALICIOUS

PDF

74.8 KB Created: 2021-03-05 10:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 69ed6013bcd21f2e3a5528135c587518 SHA-1: b03fe52edd1eec0cb3e53c149db0030d2780c7f5 SHA-256: d10f52f0c0b55a837f6067f1af5a81c41e2bebf5feb6227a637e25f697c06858
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to zajinet.ru. The document body, though heavily obfuscated, suggests a lure related to 'lottery' symbolism, likely to entice users to click the embedded malicious links. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=what+does+the+lottery+symbolize+for+rose PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488141/normal_60090adc3db36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_60160312cc01c.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/nataninididemososurema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_601f549298060.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/jimopevosot.pdfIn PDF document text
    • http://copyright-supporthelp.com/lanius_cruiser_guidezl82m.pdfIn PDF document text
    • https://bosaralox.weebly.com/uploads/1/3/4/6/134608385/a86fb1a52b9d2.pdfIn PDF document text
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/gilet.pdfIn PDF document text
    • https://fonekukiko.weebly.com/uploads/1/3/5/3/135393218/8214608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5ff852cff1f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_60379f78e5979.pdfIn PDF document text
    • http://choosemadam.site/jixidowamujupawag9c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_601a9ace30b27.pdfIn PDF document text
    • http://instup.xyz/tracfone_lg_k31_rebel_phonee7eh2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxodanokijaj.atwebpages.com/online_project_management_training_programs.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/set_up_tenvis_ip_camera.pdfIn PDF document text
    • http://vopevufiwi.epizy.com/android_play_store_showing_pending.pdfIn PDF document text
    • http://nevuvomadibavid.epizy.com/kepegujeruzomidizoz.pdfIn PDF document text
    • http://vujoxamafo.epizy.com/gasukumamisagawi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 5452 bytes
SHA-256: 30bf4f8f4f351cb95da19b4efa51614e343fca61895c9bea0473e93980e87c56
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 10072 bytes
SHA-256: 2cfb468e7a84ff6f294336805c9e278574fbeb1bfda0a4fd51c7bac808af3b4a

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