Malicious PDF — malware analysis report

Static analysis result for SHA-256 897ae07313cc0002…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 17:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4501b74d47b27679120ff81c3110c8d2 SHA-1: 185f590ae2f5526199b6b2b32c6b742c80ec5903 SHA-256: 897ae07313cc000219c013bbe52807a4674964f3a9a53e9496d187a5a50ca06a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://zopos.zohukum.com/ckfinder/userfiles/files/40972408544.pdf In PDF document text
    • https://drproperty.in/userfiles/file/28182117430.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/sezudiwurodonivabixiloduk.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/faboxemifimunutefo.pdfIn PDF document text
    • http://lovesenergy.nl/file/6658720676.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/xewebozosilu.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/lesezuwof.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/pesutu.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/fukowuwesefezemesabiw.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/77520803158.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/76123743490.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/legugewiduwazefigema.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/zexazuvixanadobumigev.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/buriwiwijagibixogi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2022b57d3---37680102556.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/xuzemefediganumesat.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vazolunabe.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/48142222958.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0acacd19c4f927548bf7693c3693ec10/xifugolewomibev.pdfIn PDF document text
    • https://aayams.com/userfiles/file/fosajofigexidoz.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jubitetojiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+wwe+smackdown+freePDF 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_off0000c40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 18180 bytes
SHA-256: 5fd1386dce9c4a3e81f89e1d9522ae9e76994849b5ea31c1776f38023e4690b4
font_01_sfnt_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 10772 bytes
SHA-256: 4b95b1d571cce175429f7e23cf472e71f7ca0e93355f23957abebb09d00c137c
font_02_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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