Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d4a6322bb1c3c6…

MALICIOUS

PDF

85.8 KB Created: 2021-03-29 12:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e1a21984ea9d649dc94f9ea3a5d83da5 SHA-1: ec33a3e625a601364de703744f193a719e986e03 SHA-256: c0d4a6322bb1c3c61499977fcc2ea72f1a3ca884e4635af90146a07131f802d9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=biographie+exemple+pdf PDF link annotation
    • https://fixubosadad.weebly.com/uploads/1/3/4/6/134658154/42ee116f.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/af94766.pdfIn PDF document text
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/8033446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456140/normal_6055cd6ae4828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_60352fc8aadb2.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/40772034762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425506/normal_60518459dd58a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fd67080b2ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_60246f2e04139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450047/normal_5ff71b9dd66f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_5fccd93fa3e57.pdfIn PDF document text
    • https://gimitowogavu.weebly.com/uploads/1/3/4/7/134746983/a6411454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/chakrata_weather_report_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2605d0ce-80d2-42ac-af4a-4df2862f7e57/how_when_and_where_history_class_8_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4458d4b-f361-4a85-a9a7-7e7c0012ff83/19146909310.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/john_deere_110_tlb_for_sale_craigslist.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/assassin_s_creed_odyssey_fate_of_atlantis.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/69341940727.pdfIn PDF document text
    • http://bozagasixafovo.atwebpages.com/49508204785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dde1593-a364-4b91-a590-1a0c17421dde/white_2010_fluid_mechanics_section_7.1_7th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f7bfb0-736a-470a-a18a-ac1f484da6da/hadley_advanced_r_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/roll20_character_sheet_print.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_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 5396 bytes
SHA-256: 35c4a071c65d4459a85503390b18fcc9f15a911130f2b10cc8b54f24bc211191
font_01_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 12924 bytes
SHA-256: af3291233cf88fbb3ccc13a4ec9fcc7ee6a05d1a70ce5169afb0fad730808131

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