Malicious PDF — malware analysis report

Static analysis result for SHA-256 617dfdb1d8674b4f…

MALICIOUS

PDF

91.0 KB Created: 2021-09-10 05:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b671da2e5efbdcff30f4edd5e508dacf SHA-1: 97765f3865887d78c774624bd2ba56b1c326418c SHA-256: 617dfdb1d8674b4f6e46b9e15dbd61c57ce0c10d4b2420abb381ce724d419f57
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=pokemon+scarlet+version+gba+download PDF link annotation
    • http://goksirlambinowice.pl/img/upload/files/wozeloropuxibiposowejon.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/jijipixomifa.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/wazuzugilixadisuvejiz.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/53724202622.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138519800750---74416088791.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/pevagugekopepumamobasuxux.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/25607727545.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/75016836516.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/39729523350.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/mofojobiximiduri.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wowepebopodemolarafavu.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/lajajojifufuj.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/vugugiwixukupenatekerad.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59320491869.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/felivozatodikivesifusiwo.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/65936914910.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/9904350460.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/ralonek.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/30129978432.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/f3mn201m81k281c45i8qhanrld/misamej.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/94574677414.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73615916625.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/58477859761.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/bedaju.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/31167015513.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/1731956909.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 11100 bytes
SHA-256: 0d0b2faafa553be1b7cf0bc008c341ba44bffc9528692693fb25a2a6faeac13e
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 22008 bytes
SHA-256: 37e5d90688a6cd96539d839d9991545828794440fb031365820e455515944321
font_03_sfnt_off000148c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C9 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973