Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c3ac17dfe6e2f2…

MALICIOUS

PDF

88.4 KB Created: 2021-09-19 11:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c83e04ccb8d9fa7c84bd3d91a5f3e97d SHA-1: a786937d9d8d54cff8e8629e639829dc38484978 SHA-256: 02c3ac17dfe6e2f222661f5cd97779ba55248826d5d3be99c0aac97d9d6a06a8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics flagging it as a link farm on disposable hosting and pointing to algorithmically-generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=gry+pokemon+na+androida PDF link annotation
    • http://club-integra.ru/userfiles/file/kefogulomugas.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/55458726579.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/tufufubimofeda.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/natinupozulimabumefa.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nopubozed.pdfIn PDF document text
    • http://master-br.ru/img/file/60687492439.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/bebepujivuxubi.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/48561579306.pdfIn PDF document text
    • http://fittbikese.hu/files/file/91958141159.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54107745540.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/zupaseviguruluxut.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/rubewobovogasaxitefivuje.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xefidovugivuliriduzan.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/fuvowina.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/midadidesinojarukijazab.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/65537556366.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/vofisubifoser.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/motatemorebofog.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/legazuzazemereku.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/likawazevijetimipuji.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161401acdc595b---tedegekisaworegupo.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/99100717759.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/43055367696.pdfIn PDF document text
    • https://palet-school.com/files/files/81315005720.pdfIn PDF document text
    • http://huntland.hu/upload/file/bolas.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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10488 bytes
SHA-256: 7d38fd9e5f8bd734b9998049063c58c831b787c267701520c37602f930c3e8df
font_01_sfnt_off00010c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 18208 bytes
SHA-256: ae5e9ae23acf4097a50ea179ce850b702ed5bd91d24952ef57edff8c764e1895