Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c4117f2144d62d…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 00:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5c65e999edf518b0a9ab781b3e99f77c SHA-1: 115256d5a1801f55655161cc52d745a6163ef0bf SHA-256: b4c4117f2144d62d592b4a13257c00bed9dbc7f57aecc7c9d1aa3c4f5bc692f1
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('xezojetit.ru') that is likely used for phishing or to host a secondary payload. The document body, though heavily obfuscated, suggests a lure related to business partnerships, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://xezojetit.ru/award?keyword=advantage+and+disadvantage+of+partnership+pdf PDF link annotation
    • http://srakan.space/18409557307webdb.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_long_does_fossil_gen_4_battery_last.pdfIn PDF document text
    • http://testertumentum.space/neil_degrasse_tyson_net_worth_2020cdlee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixetatop.epizy.com/kipav.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/crazy_frog_dance_mp4.pdfIn PDF document text
    • http://kujujonagojatu.epizy.com/pezogofigilibotorurum.pdfIn PDF document text
    • http://wusanobe.rf.gd/62991827383.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_571e828647e3465684432c028e30ba5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/graph_paper_printable_8._5x11_full_sheet.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/aadhar_card_form_download_gujarat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28293e0d-5db5-41f7-8559-b1ddc8efb836/jumigeminebuwowinevon.pdfIn PDF document text
    • http://niwurekatexo.atwebpages.com/zufenugasov.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_838cb1d7ac164ead8663a05dbe03778f.pdf?index=trueIn PDF document text
    • http://ximedamolaxeve.epizy.com/85351072728.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/microsoft_dynamic_crm_developer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1a9150-05ca-4618-85a2-aa6f4870597d/ranuwovoxetixixagapubu.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_0f09b6c37294489ca59ddddd0e9b5b59.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_c7df3c13d01a492498d4e8a66a93f261.pdf?index=trueIn PDF document text
    • http://fodixox.rf.gd/91053159911.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_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 5320 bytes
SHA-256: 759a6e96ac4ffddd46b894a97603ce018404a99277ff547eb8908367a438c3e4
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10708 bytes
SHA-256: 15b373f8943e07a85117568cba3fad81e37d6e8e076eee11e8434b944fbaec11

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