Malicious PDF — malware analysis report

Static analysis result for SHA-256 873952f57ce2cc4e…

MALICIOUS

PDF

66.3 KB Created: 2021-04-02 02:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a257b61cecca9298b3216e4037c02793 SHA-1: b1918f81ab5d4d32ebb5d8ffe9cd8819d64b111c SHA-256: 873952f57ce2cc4e7d64fadc8cbd8e4937fdfd4b7009d9e8f7e80ba95e2808c8
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=alagappan+clinical+medicine+5th+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/vavefamixivi/jc4H1ji/nufivexu.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/SicIHic/vobatiwafolewewuwuwixozog.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/i8cheYb/youtube_lyric_video_maker_download.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/togumesivufuvekafuro.pdfIn PDF document text
    • https://cdn.sqhk.co/dejegekonula/jcIOfEr/27285120180.pdfIn PDF document text
    • https://cdn.sqhk.co/daluzowinasu/gf2SgiS/fuxaviwewegune.pdfIn PDF document text
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/tadadorevokur.pdfIn PDF document text
    • http://befujukipepejem.mygamesonline.org/fuwopokesesogonivixosupav.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/tigbjjQ/varovopuzajuxokijorelu.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/tjegg0y/cheap_authentic_basketball_shoes.pdfIn PDF document text
    • https://tumafivefaj.weebly.com/uploads/1/3/3/9/133999435/busumefok.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/2licOib/tajixipu.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/lumarodipopera.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/takurugilij/71162070740.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_066b7cd5108d43f08b29e7b284f57d83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/the_breadwinner_full_book_summary.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_053e422271d04798b72574d5f60dbfa7.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_a6fdf2056a6e468a951a20894847dba3.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_c38135c8815343fc8055f175df43c7eb.pdf?index=trueIn 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_off0000c5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 5596 bytes
SHA-256: d3b823ab1f6b9809a1681d97dd3c6329bad2aad37c2436878d69b7a1308781ed
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 10028 bytes
SHA-256: a9c42c76f806de7723c152073ff72d9d24517805a9b9f807a4f25c3f02a173d4

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