Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcb26b0d4f5522f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 10:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ea518abd511dd5b7e354b965ada18e5 SHA-1: 4dc2f939e08a09507e12239c084988060e32ddcf SHA-256: 9dcb26b0d4f5522f65c69c03a056bdee3e827ea32b7c57581372bb7f9f8cb53d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm with numerous external URLs pointing to other PDF files, suggesting a multi-stage distribution or phishing campaign. The presence of many distinct hosts and UTM parameters in URLs further supports a phishing or spamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=house+of+fools+watch+online PDF link annotation
    • http://ihanzao.com/userfiles/file/20210908155103_1418612866.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xunatasepeg.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/89233206872.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/64311871264.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/vejamunudobo.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/kunerode.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/59097289215.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109062328032904.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/zevuzezew.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/medorisunitemekivuwakew.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/89008873444.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/natirutobuzoxonufawakimu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/niwanawowovegil.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/20219164377946.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/mokajewakeled.pdfIn PDF document text
    • http://ruresept.ru/files/file/48887404306.pdfIn PDF document text
    • http://newo.ru/files/files/83327897655.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/novaruxanem.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/dabom.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/sawemakexenubisozisema.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/22601140372.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/kofiziwepunubukopup.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/pepadepovikizonij.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/26971123222.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370f69c52e5---30475393785.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 18116 bytes
SHA-256: 8f36fd490a444172f8dfd820979e1b9819d5696c26dde98dc720ff49177ab85f
font_01_sfnt_off00010e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 10512 bytes
SHA-256: f98544fca8c2cd596c1d2ef110a987fd0629b86050e396248bb64cb17a706909

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