Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dfec75efc8b454…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 19:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e66e355d0a72806f423f3cca1eca78c8 SHA-1: 682e8ae7173e0294ce4817aad8fa820aeec0aa24 SHA-256: 89dfec75efc8b45421db7d92702f09794f758f1b5028b7e898b5f9f49eecbb8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aldobini.it/userfiles/files/niberivebojefiludobusegaw.pdf In PDF document text
    • http://elektron.be/public/userimgs/files/41923773180.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zamavufawupokako.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/21619340942.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/52397253934.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/60362840366.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/jopexafigoraziripezer.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kutot56jd0qm58mvg1e9n8tns5/93941637110.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/1565057558.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/68622905832.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109121033169172.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kunedo.pdfIn PDF document text
    • https://hirurgija.me/files/47801459260.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109061037522376.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/vajugagigebinatatemujarel.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/vofoveg.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/70240604327.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ribemuxumeveleneju.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/77225270714.pdfIn PDF document text
    • https://petribax.com/userfiles/file/nafaviwasererigokapesulel.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/kiwagetanutobak.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/73853942461.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465dcbde41c---47938009323.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210928143036.pdfIn PDF document text
    • http://zerosquareonline.com/file/muzivapanuzex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=steam+in+home+streaming+androidPDF 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_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA0 10724 bytes
SHA-256: 472d09b70c5042ac26cc10eaac1de33ba36cd2f7747fe3e85de638e296b7c098
font_02_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 17992 bytes
SHA-256: 27b95f0017dccf437ca4e783b32826ccf7335446c85c236fb4b7c98dec5900f3

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