Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e67d29a123dfba4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 01:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5cd6a11efe7541d430e4efd53f873d31 SHA-1: ec88ea91cd76391d4f323c322519fa691b5db19f SHA-256: 3e67d29a123dfba48bcc5a208d2d9faabf51d4a191928cc0d60f8c73b9fcaa64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute or phish via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=hidden+call+recording+app+download PDF link annotation
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/74209741868.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/52670414339.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/tejajomi.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/66563574460.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/budewuziwufonawaru.pdfIn PDF document text
    • https://rubfila.in/files/file/satoxubas.pdfIn PDF document text
    • http://canadianrockies.info/files/file/lelerubezimime.pdfIn PDF document text
    • https://buka.ru/sadm_files/zudoxesetodofip.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/45703669066.pdfIn PDF document text
    • https://fivetc.net/uploads/files/38046718643.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/892963eb12a4f90de40bbf40b1c71222/90724308021.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zasanutefuw.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/52660439032.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210907_20CE84B12655E98D.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/67919880404.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/42211207542.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/95242046206.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/zofekuveziral.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/varitagilokisivetidonak.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/velebipuzajevub.pdfIn PDF document text
    • http://eichler-kammerer.de/82441012653.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/lotomefenidosuboso.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lategasesipikebaxuseza.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/liporezuse.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/fojifarobid.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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 17172 bytes
SHA-256: 5bdc076af44dd7b00efa80190169db4c44553d21c59c202bed942d5ce09a0343
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 10500 bytes
SHA-256: 59c089c209f6b83d75c4220e7e2f8adea4d0be16bc9632100d31d83054cbdef5
font_02_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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