Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7dd3c013d7bc1e…

MALICIOUS

PDF

81.4 KB Created: 2021-03-10 21:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cd649b9cb3dd189b83e803793e671b5d SHA-1: 38610973a9f3333321e006c11e3c20058253c6d6 SHA-256: bd7dd3c013d7bc1e3606b29232de098d9e13b4fce11b1b0c9e8b29e85da5dd63
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan signature. It contains a large number of external links, with the primary suspicious URL being https://kuzutuzo.ru/award?keyword=apprendre+le+piano+en+24h+pdf. The presence of numerous links suggests a link farm or a phishing attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/award?keyword=apprendre+le+piano+en+24h+pdf PDF link annotation
    • https://cdn.sqhk.co/xasurila/igdjcFS/zuforaruwibisonalogelatig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5fc5806a2354f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409258/normal_6000205695010.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/iegetq8/32112998854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_600e301c435d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470677/normal_6036fdbf29e46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5ff65ba5de5a1.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/zarelusipofox/due_diligence_review_template.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_86cddffbc7cc4219b4502fcaa430c316.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/4261096171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20174e7-2a49-4af2-9e32-257e625f3021/22291444948.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/crash_bandicoot_1_relics_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/83800097061.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_08169d9e497643afbb3e84118b7d259f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5d8c58-87a1-41ab-9544-45952260823a/beethoven_piano_sonata_no._7_in_d_major_op._10_no._3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a10816f-640a-4ffd-9f5e-1e8639dcded5/39632333587.pdfIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_2c13a158c7864af380d4835d799dfc68.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_603bc93b9fe144b0a3f5c7437b623674.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa595b4-5324-4aec-a719-c6bc5bef649a/28420462083.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_1472b514781d4976be7a340b8ecb9875.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jigezilor/sevag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340b6e1d-63ae-4258-b280-a1a17d975793/how_to_set_up_airport_express_1st_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8776042c-c8f0-47c7-8753-27e8be7691d2/nunuzeber.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
stream_004_off00010eb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10EB0 12748 bytes
SHA-256: 41c746aaed3e58c1f46505eeeda5f52eda4727a05b2f76b7368a0b86aae014bb
font_00_sfnt_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 5160 bytes
SHA-256: 80264c14dc0e3752229653fe5e0be7d463a798748b2f66f44338ef5f18475fa0

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