Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfd2f83b76d366d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 03:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f724ac3164c3608e82c51b8028b143e SHA-1: c9d7e8d2ae8e71ea32ab9e1c38a037bf933bd528 SHA-256: 6bfd2f83b76d366dad00dc869a643e10277dbe2786c7e8515824bf2a05147fec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the link farm heuristic point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lngpetro.com/userfiles/file/50365752342.pdf In PDF document text
    • http://csc0311.com/userfiles/file/20210911064202_vfrlt6.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/28/file/17793455281.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/rujegapakizeserofaliv.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/duvemupuwatigonuliwigal.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/72724912303.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/fadagilovibugaran.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/tuxoligiwur.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/fufoxe.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/15196915451.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/jojosaku.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/fomewowopesozat.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/7106886791.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/raleveropamovew.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/48951451415.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/16605740937.pdfIn PDF document text
    • http://espokebar.com/uploads/files/zugewolewomobizepiniza.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/sijixujirujezidop.pdfIn PDF document text
    • http://industrialdevices.in/uploads/pilubavad.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210927060457.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/xebon.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/76090372620.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/gosuje.pdfIn PDF document text
    • http://ux-school.ru/files/files/51962380061.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xajefilip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+card+game+online+androidPDF 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_off0000af28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF28 15580 bytes
SHA-256: 5ff08c9bbdd197d1a5cc10015c574707800262adf14911ad254bf72a3594e286
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 10540 bytes
SHA-256: 0ddb08ac6846f6128544d72072e93db973d6b2c988b4fa406a3c93be967d17af
font_02_sfnt_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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