Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab5966bdcbcfa7c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 02:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c1da68f4fccb42588aa38460ef7193d SHA-1: 48a301f5bff8f562bcb126a0038d93bdee4a1f98 SHA-256: 9ab5966bdcbcfa7cdc9fe9a645f8b2eb6c5de86b5769cab567674f1e14030ee1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, 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, likely to redirect users to malicious sites. The embedded URL 'https://pixomot.ru/uplcv?utm_term=puppy+merge+game' is a primary indicator of this redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=puppy+merge+game PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a18daa1---98713260623.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/65517652847.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/63849797628.pdfIn PDF document text
    • http://rapet.hu/files/zaruwejaxubirubamakomozid.pdfIn PDF document text
    • https://777mto.info/contents/files/9914827544.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/93915098037.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/dl813iudova94i4ggdafqjfb45/42179000385.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/79993116942.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/xijomojukuxepazenakoso.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/46554289475.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/66548702033.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/20884784885.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/10969131770.pdfIn PDF document text
    • http://pileki.com/imgup/file/43026878978.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/xalumekani.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/gunubazaguvopuvafuzol.pdfIn PDF document text
    • http://santeh.md/img/files/ramumerik.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/jemuvevavonubo.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kidesegaguxig.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/63120878389.pdfIn PDF document text
    • https://sealskinz.ru/files/file/14194357188.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/gasodipil.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/jeribikavawov.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zeviwagifabisukakopak.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_728067B2F8E510B4.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_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10180 bytes
SHA-256: 5f3434a5872262b7a804a4dd14d0cedba6f08b0606c9ee4e354b61da9e304d21
font_01_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 18304 bytes
SHA-256: cfe2f7891fba476fa1bbedde675cea9d3deda5f0c440e4d22ee37dd32a5bb18d
font_02_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1