Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cbccfa83031054…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 16:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e7a0436c382219cb5b45c5fba7626ef SHA-1: 8485bd0d45116442ed5fc45d810664651b22091a SHA-256: 70cbccfa83031054349ca217afb675ad9c5c7fe0feacc44461d6678ea7da3b4c
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 phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/2974633059.pdf In PDF document text
    • https://stalbeckers.nl/userfiles/image/file/43940416264.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/9341079289.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9195bed236373970735a569c1849d075/daradexuxerunaku.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210901_052107.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/tasoxupenifunudam.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161419b00b4bf0---bofowatolupu.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/lavafudosikagi.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/13558237643.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/75114143087.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/79842392543.pdfIn PDF document text
    • http://cocoal.com/uploads/file/papenopozasasasatuganajof.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/pewisojuz.pdfIn PDF document text
    • http://stevis.cz/files/file/69980432861.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/bojetupego.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/45889381628.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/11285819352.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/zuxujasajujuwalosak.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/22858063425.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/baliwepojolapumawe.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/nixabibolak.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/48637524136.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/muxikisasemupoporuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+shippuden+senki+mod+apk+free+download+unlimited+moneyPDF 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_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 18516 bytes
SHA-256: ae5da4c5f4b2f94241e82ff0f9c4cf114e026b981b3099637e7bf9ad1d1b47d1
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E53 11132 bytes
SHA-256: 011367f9cb5e2d03c78e59b10c9de6790d1abdb6fd847b46356e9f79218ddc39