Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce976f3f1d504d1f…

MALICIOUS

PDF

70.0 KB Created: 2021-03-01 23:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7852d0d00ff37817e5aa27aeb2040df5 SHA-1: ebcd2a393613d1a2975e204e8bbb3dfe8ba71b1a SHA-256: ce976f3f1d504d1fb7aff2cd518f9ef891a099f367f628f80f8c4ad231b69a66
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/123?utm_term=roland+tr+8s+buy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476274/normal_5fe93e3e0b686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409806/normal_600bbea69ca03.pdfIn PDF document text
    • http://mignonette.space/citizen_skyhawk_rubber_bandzj2pn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462351/normal_5fdca432093d5.pdfIn PDF document text
    • http://5coupon.info/64102639568qciz5.pdfIn PDF document text
    • https://cdn.sqhk.co/nosilaxuziz/fhd2N2J/65220675785.pdfIn PDF document text
    • https://cdn.sqhk.co/makubeku/dFhfTxG/sekaparefodipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_600c1413480ac.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/xgdq7C9/43932760343.pdfIn PDF document text
    • http://pek-24.cc/wekukuzz27pp.pdfIn PDF document text
    • http://app-3null.com/61718578598ssgwk.pdfIn PDF document text
    • https://cdn.sqhk.co/mesodimeduje/Ygdjegd/40946886113.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/894833.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/bezutu/vedekusukixamususeses.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/fupegevupadavinigiru.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/tiferulukasekikeluxuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/division_without_remainders_worksheet_ks2.pdfIn PDF document text
    • https://www.andertons.co.uk/drumIn 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_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 4976 bytes
SHA-256: e6a10cf660116dcbfdb7c63232d11316eb9bedc67a441afa8f739034798be6e3
font_01_sfnt_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 12204 bytes
SHA-256: c5fcc6ed3294684ac1684198de9f9d908156817fd184be8ab8cbf2251e9f3521
font_02_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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