Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8143c14761ab666…

MALICIOUS

PDF

84.7 KB Created: 2021-09-10 16:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b51e3391ae0eb557780781864ed85fb SHA-1: c49995a7c2247177fd327cc322283d64b7e3a4d8 SHA-256: d8143c14761ab666bef61337842796484949641d32d16a22942a1bed020459f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate that the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=best+shake+effect+app+android PDF link annotation
    • http://tamlaproject.com/userData/board/file/pisetupodopumuk.pdfIn PDF document text
    • http://klenderbio.com/upload/files/98262940331.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/dituzon.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/zowok.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/902758194.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/paxugijud.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/baguwus.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/50948522186.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/namozaxuwawexuwiz.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/pufonilin.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tajok.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_F187A0DA113E12AD.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/44247301973.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/pevekitebazijejonaxezoja.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/94982351509.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/89106567347.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/83104989672.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/16233857431.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/vuxasori.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/linajiwozuwenulamuxeb.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c713472ce---20083055407.pdfIn PDF document text
    • http://youil.org/userData/board/file/zasepigutesafirexomag.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/nukomujeretukule.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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_01_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAD 10816 bytes
SHA-256: 8a8a2ac100d23730cdc3c92aba01631f17b245ba98b3dcee85b1a9ae5e18ad99

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