Malicious PDF — malware analysis report

Static analysis result for SHA-256 2488454cd5c9be90…

MALICIOUS

PDF

81.3 KB Created: 2021-03-11 09:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 695047f95ccbd74246815779574c743b SHA-1: e18e4440c259aabce5a3d1dbf5bf10ad0ebb63f4 SHA-256: 2488454cd5c9be909272fd49c57aeeb704b295ba9c8c8db56068623036797738
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, common in phishing campaigns.

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://bologen.ru/award?keyword=basic+chemistry+quiz+questions+and+answers+pdf PDF link annotation
    • http://reweder.site/birth_control_methods_spanishkoj0e.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/enXws0x/20714138580.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/aladdin_arabian_nights_piano.pdfIn PDF document text
    • http://lawobusupovapuv.22web.org/30110590658.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/sahjgen/wheel_of_fortune_free_play_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/G4hhMib/51075964058.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/95541364170.pdfIn PDF document text
    • http://nuvagefo.medianewsonline.com/how_many_branches_of_burger_king_in_the_philippines.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/how_to_use_a_whirlpool_thin_twin_washer.pdfIn PDF document text
    • http://tb-films.ru/ximinidefupulowijipopjs58.pdfIn PDF document text
    • http://hookup153.fun/wogawowonubefujabhsk8.pdfIn PDF document text
    • http://xivazokib.medianewsonline.com/rimidobokejikik.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/bejenosugede/oxford_mini_dictionary_and_thesaurus.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_e4c0af4e95734b7b9fbfe9c381a091f4.pdf?index=trueIn PDF document text
    • http://sufelubunat.epizy.com/data_ingestion_platform_architecture.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_7bc16ba648cc47ca95939555f3b13481.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_dc9e58a545e242c9a80675fb822f2594.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_39dd74bed048472e9dc3144046822451.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_1a45f898c0c841e388105379679dc21e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/povodijirig/1106197663.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_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 5780 bytes
SHA-256: 7b7b4115ac68d1b2995bc2859321d85632256ca0ea451391f898ae3a9bf51994
font_01_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 10840 bytes
SHA-256: 7229a186f4270fe02d2e142f93804688dd7e5fdb4cbae1c332906a352e89558a

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