Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d73517fd45e8af…

MALICIOUS

PDF

71.1 KB Created: 2021-04-02 08:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f58bc067d34df15194652566d297bdda SHA-1: e956e48f6a3adb388c2983109c187bdf2c937845 SHA-256: 83d73517fd45e8af53283761702f73d64b6981574ea85b2cc5635355adb6a32c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. One prominent URL, 'https://jumiwimov.ru/award?keyword=orchestrating+productive+mathematics+discussions+pdf', suggests a lure related to educational content to drive traffic to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jumiwimov.ru/award?keyword=orchestrating+productive+mathematics+discussions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493198/normal_5fea2bfebf608.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457586/normal_5fcd9eee34a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_606589a0eadd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_604a33672701a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_606689fae2664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_6065cf58ecaad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_6023e059ba1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_6011ec26c956c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_60030940b028f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_da83b80fc94d4c2aafe23e603b0cdeae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/nyc_dog_owner_s_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/73313729956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997ec5c4-a20e-4830-8aca-3d6965a3f74a/59904588694.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/ccna_module_1_chapter_1_answers_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79988c55-75d2-4f8e-b144-f3fab291bba4/is_the_wave_in_antelope_canyon.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/to_perform_the_assay_of_ammonium_chloride.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/xonabezexawafu.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/26026578687.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/litorirujimobon.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_b974572b8bef4ac88a8afa97b20f8771.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/ambarsariya_diljit_all_songs.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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 5624 bytes
SHA-256: 898eb3623ba955b2a5cfed1b4869f38338257b5c5e185a9737164fd351337e3e
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 10252 bytes
SHA-256: afd59ee09414770d28b53699a49c03691c0e4f593e3e33049780c76501f6c801

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