Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3c8fc0e38ebee5…

MALICIOUS

PDF

68.4 KB Created: 2021-09-13 22:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83af1f88d789df766a3efa87179c9efa SHA-1: 17ecb44747820a0ea4beeafcb900a5637193ceeb SHA-256: 1f3c8fc0e38ebee542a297fd8b3b8ff15ca04d50c5d3ad8129ab130564a7783c
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 link farms hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this is a link farm designed for SEO manipulation to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=gta+vice+city+burn+download+for+android PDF link annotation
    • https://wilocom.ro/ckfinder/userfiles/files/gumegonozobotawizu.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/xewasilapurug.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/72526715269.pdfIn PDF document text
    • https://energooptima.hu/upload/File/sijevawuz.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/wewun.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/24357769230.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/43124181750.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/78551668830.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/pawugozofetabutokep.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/jagitadiforapuzogakom.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/77705428942.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/60831708868.pdfIn PDF document text
    • http://foxhill101.com/userimages/liwugusuzivi.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/96608834364.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/27632669470.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kejunusalotaloxesoro.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1incldq2o917u8pb0a6ohqpto5/nunodudalorijose.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/nixuberuwekajabusipi.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/98998716725.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/lukunamutitigiwug.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/68642386814.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/xasiwodolaratezik.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/sifiwel.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/zevadovepasizonutarowexas.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_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 10844 bytes
SHA-256: 85c71cc181ac999c79d1a0a3ea12b51225616a2ac126352bcf740bd04a1c24b0
font_01_sfnt_off0000c883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC883 14344 bytes
SHA-256: c2c336af48ce20cd96455218524d6bcd535c2d3234476be44666c2d04db01941
font_02_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1