Malicious PDF — malware analysis report

Static analysis result for SHA-256 4679ff961cacecdb…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 09:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c106b76ca09663fe4d52b40ab188b87 SHA-1: a3c0d07511ac8b249c093d27226d3ef861250658 SHA-256: 4679ff961cacecdb18ca5e8ca32496ce0f6b7647a2b4ac0b2eb4cb1f2fc7004f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://taiwan-casters.com/userfiles/file/kanojupulimelonazezekowe.pdf In PDF document text
    • http://finemetal-cn.com/upload/files/sudeziduleduxaxupufuti.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb777e0dee---faxivuwenisegigibat.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/zetigodujorozafiz.pdfIn PDF document text
    • http://livestocktool.com/d/files/80401681455.pdfIn PDF document text
    • https://renetravel.ro/images/files/waxulenofavunog.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/gogovenigule.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/26078537516.pdfIn PDF document text
    • https://askflip.com/uploads/files/18817562561.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxowifelimuwozoniwu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16151db08a7a80---kupevafusil.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/semejumakevuvasukotutukos.pdfIn PDF document text
    • http://landpas.pl/upload/file/xebawosuzikige.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/99714181548.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/zepokajopiledem.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/5571460276.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/67633380622.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/rumotedar.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195513303821.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/fudegoneruwek.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/jemixot.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/lapufudolidu.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/koxojozenasujopeduzuvo.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/bavabozulunamezapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=top+auto+chess+gamesPDF link annotation
    • 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_off0000af3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3A 15048 bytes
SHA-256: e702d1fec6ffb8041d0d85c7062fe10695dee21b23c098f7bcbf950b837a1e8e
font_01_sfnt_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 10544 bytes
SHA-256: 2c83130445df90fc41e85895fde76475f5f7165b5d2d17033c5bbc58a9e204a1
font_02_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1