Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc676a78381a50e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 09:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1eff63b4bdae2f1dde6152b831ed51ec SHA-1: e304c0077d5bfdba479eba95a4f1b94bf711910f SHA-256: 2cc676a78381a50e9f85850619d3cb1734fd9b70c1fd1899a2bbdd880b469c43
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=free+fortnite+v+buck+codes PDF link annotation
    • http://indianmailbox.com/assets/images/userfiles/files/79441299359.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/95318435597.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/82609347279.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16133304db3741---dugufazofalalevu.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/54745949134.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/16208025445.pdfIn PDF document text
    • http://lagrupacio.cat/file/gezofepubedigapox.pdfIn PDF document text
    • https://halkum.rs/files/bavazexujimevobezoxigov.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/31313498962.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/35755190843.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/xewenelituzazolojeluloxi.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/9389767525.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f479osrd09jso7651jb4m9tope/xijuzibitamokewoj.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/pekuvemuxipirowom.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/nozovumigeremira.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/kugokaloduvosevulezepid.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pudomixoxolufo.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210905221930.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/91910310344.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/89706232760.pdfIn PDF document text
    • http://rinsacars.com/files/others/2147679067.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/80388520889.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/dofox.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/kewegibizeripezaxul.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/22114132392.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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 17872 bytes
SHA-256: 245207062bd3d24339de3756af161c327921901184f5ac9faf353ba7ae503018
font_02_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 10636 bytes
SHA-256: cc3a035398ff11d524e45a5fba624433f6c6aefb5eba32219df1e2ff5703e2b2