Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f7d2865306b287…

MALICIOUS

PDF

72.6 KB Created: 2021-06-01 03:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c50af0f2e2109d92edfc985876a92804 SHA-1: f4efb3437f50a0f2eee227c56b32940a68258b3e SHA-256: 84f7d2865306b287cb10526be49c38639e4845f908027f5701297487b642261d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

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://laborke.ru/pbw?utm_term=family+tree+printable+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445889/normal_60028e40ece74.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/pesavisejanik_tejamuvugalo.pdfIn PDF document text
    • https://mamowoxu.weebly.com/uploads/1/3/4/2/134265364/siwipazadapipogoguf.pdfIn PDF document text
    • https://peguwuxawotenu.weebly.com/uploads/1/3/4/5/134582441/zaputeri-bimigowodevu.pdfIn PDF document text
    • https://loxufoxoxow.weebly.com/uploads/1/3/5/9/135982175/9573304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497353/normal_601b5097a2fc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_603b974837395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_6018dfb395110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf9619ed78c.pdfIn PDF document text
    • https://ziganuridu.weebly.com/uploads/1/3/0/8/130815115/benoravefera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5ff46feb7e0e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuxikadafi.pbworks.com/f/telujuwetip.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/how_to_reset_tp-link_extender_ac1750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248d2680-2b00-48d1-bf5c-59668f864147/sibezosora.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144424044/english_file_upper_intermediate_students_book.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/thai_jashe_movie_download_link.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144438705/12455648158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/125c3019-dce4-48da-a32a-7885acf0a9df/catholic_bible_study_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ac6029-4505-45bc-ae07-017f72c81a34/little_house_on_the_prairie_book_set_hardback.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144438525/ragokakazev.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_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 5204 bytes
SHA-256: 4cec75fefcd2ffcc03f3483835d3dd8b9d786abd56401f61e9891e5e35af0e93
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 10400 bytes
SHA-256: 0d3360aefa22e9e8803a86bcbcedc057cd6d283cf126aaa86cac5f29f88f5e0e

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