Malicious PDF — malware analysis report

Static analysis result for SHA-256 36772fa4d5ae8ab2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 14:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3586dbd8e94232d9c4f0ca9523feb376 SHA-1: 00badb56f31a93b1726f305629033119232fcacd SHA-256: 36772fa4d5ae8ab2b41628c00642343840a93c0838fe92f4bd43b525e50e01cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting to malware. Although no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://xn--franzsischebulldoggen-lec.eu/userfiles/file/56306840142.pdf In PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/74758811.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff0002e8c---xavitixatebebefugone.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/22630051461.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/pivixulirelutazar.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/15646994622.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/75598680191.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/64814484507.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/19231500966.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/sakuzawunu.pdfIn PDF document text
    • https://esz.jp/img/editor/files/61394624112.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/63845514509.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/kexelalewidapukazib.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/zozotiseluf.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/kuzekobake.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/89101909359.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109030600397080.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/kovalebewutojedanokat.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/85249965237.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/befitixixinuropidaj.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/jaxumiw.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/76708579790.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/kabitokakelokugawizezeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hostile+environment+awareness+training+%28heat%29+pdfPDF link annotation
    • 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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 18288 bytes
SHA-256: 68c0b5dd38a89a79f7ec74f81fbdf39d2a89ad29e19347f3bfebe7d98172b79c
font_01_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 11244 bytes
SHA-256: 5d33d051e8de408a56f1f60c283e66caf1172882b4f449351bdb4d9b5ea765cf
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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