Malicious PDF — malware analysis report

Static analysis result for SHA-256 10496be0c1db282f…

MALICIOUS

PDF

75.3 KB Created: 2021-03-16 01:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00cc7f4eb2320ba361e4191f3773597e SHA-1: 4ca763d63a627bf17a68e8cec952bf4c4c05ef92 SHA-256: 10496be0c1db282f8176a76f8d12ccdac447d93ab42cd0e0ebe574d7ce10b6a9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to redirect users to malicious websites. The primary URL, 'https://pelibifir.ru/award?keyword=ambiguous+sentences+in+english+pdf', indicates a lure related to search engine optimization, likely to phish for credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/award?keyword=ambiguous+sentences+in+english+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5fc8d2e372b5c.pdfIn PDF document text
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/zufoturubiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443292/normal_5fff700a0afbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366005/normal_6005ea336f2f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_6044faa6b94ca.pdfIn PDF document text
    • https://welajewovire.weebly.com/uploads/1/3/3/9/133999455/wowowop-pixodijabubiriv-nimiralux-kilefev.pdfIn PDF document text
    • https://jemiliwolozeli.weebly.com/uploads/1/3/4/8/134870182/9138213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5fefa9fe3ed8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503197/normal_60166d6d166d2.pdfIn PDF document text
    • https://kaxaxelakag.weebly.com/uploads/1/3/4/2/134235500/pitom.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/xupimud.pdfIn PDF document text
    • https://jakikoxu.weebly.com/uploads/1/3/1/4/131411542/493d1a47ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_60391e6283da6.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/lodaka.pdfIn PDF document text
    • https://lomowurepiv.weebly.com/uploads/1/3/1/4/131437546/tivexisidi.pdfIn PDF document text
    • https://ledugatikafaf.weebly.com/uploads/1/3/4/6/134693541/1687178.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/kubomiwipon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_600d953d6873a.pdfIn PDF document text
    • http://mesikigodijope.mypressonline.com/badifi.pdfIn PDF document text
    • https://kunokepipadiri.weebly.com/uploads/1/3/3/9/133997431/gipebemeke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 5392 bytes
SHA-256: d186ef1ce44df0fc46f548a7af5b71e67b84bc3229374b53b1a5e2efd68896df
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 11168 bytes
SHA-256: d47ceb022d8c1e9cbfccf338c06deb7212aa2f76f6931c01480a6d96fb7e3de3

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