Malicious PDF — malware analysis report

Static analysis result for SHA-256 356dd50c9f0f2b65…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 12:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3815d83689e6ed28e2c1236032d7126d SHA-1: 2465243570bd8d0127b04455423b1c29d0e8c11b SHA-256: 356dd50c9f0f2b6506b166efeeba3336363bc3c704cf6e6b361b09056c9f99b1
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://zajinet.ru/award?keyword=holt+mcdougal+7th+grade+math+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408355/normal_603c3e8e9a525.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/fgjuChg/where_did_you_go_meaning_in_bengali.pdfIn PDF document text
    • https://kibinino.weebly.com/uploads/1/3/4/6/134603545/sumadajir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_604e62626aa18.pdfIn PDF document text
    • http://kinoxca.xyz/list_of_common_adjectives_in_english4i7ol.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/wepibinetebuwesebodi.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/Eggdhgy/22277542892.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/dobor-xozebo-belogu-fusojitonudaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_60306169c5fe9.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/pohfq3U/tie_dye_background_pink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_60060e916fa56.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/adjust_accelerometer_sensitivity_androidl4fhn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391001/normal_5ff6729915c18.pdfIn PDF document text
    • https://miletotafog.weebly.com/uploads/1/3/4/7/134758503/7ec37a.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/zelepuba.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/zasepo/58614437157.pdfIn PDF document text
    • http://ninoxodibigadar.epizy.com/nozimu.pdfIn PDF document text
    • http://fofeparulofiz.rf.gd/ironing_laminating_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/base_de_datos_distribuidas_mysql.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/pride_and_prejudice_book_summary_shmoop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 5364 bytes
SHA-256: c3795aeed288ad14813a5563613f629112fd7bbc58226d763d4a841697220d3a
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 10668 bytes
SHA-256: c66d850ceef7cceda84393718a43c7012b14371e8680ab24441ca876411a0cef
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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