Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a375180996a636…

MALICIOUS

PDF

69.3 KB Created: 2021-04-05 01:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 44e1fa576301dec62b94b59fc48b1733 SHA-1: 5dc02d2ba306729f0b1805845b547960600e44ce SHA-256: 36a375180996a636616506f30dbfb6ef3311a720d2bb4b6231b0806f24686b4a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a specific PDF title, directing users to a malicious URL.

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://bologen.ru/wix?keyword=hunter+the+vigil+compacts+and+conspiracies+pdf PDF link annotation
    • https://cdn.sqhk.co/jagibuvat/jgjihiB/81310737578.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/bacteriological_incubator_sop.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/HXzibYI/e_wallet_without_bank_account.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/ehhiFOO/wamowomakago.pdfIn PDF document text
    • https://cdn.sqhk.co/gipudeviwapi/gAibgeA/dupogugunabepegebax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5fca5f45b4049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_5fe8d7a831903.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/jawjbhi/2998737619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449170/normal_602636b7eca0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_6036c5dbe3995.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/beatriz_sarlo_la_imaginacion_tecnica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_6032481a8199d.pdfIn PDF document text
    • https://cdn.sqhk.co/bipufawawi/hfPngiU/55903283286.pdfIn PDF document text
    • http://zijofazasogija.getenjoyment.net/tabela_periodica_exercicios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pusixa/73941992328.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/computer_network_mcq_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/brahmotsavam_songs_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/rebosibunarijagixu.pdfIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/21879807557.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 5472 bytes
SHA-256: 441c395b813cbe7c56c75c59dd5a871799818fbd54f1bef56224793b8c2ac673
font_01_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 9352 bytes
SHA-256: 9922eea6d1caaf0e9be8c325e9ed759c6866af337e7fb6656a9aecde4f49922c
font_02_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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