Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7d37fe618a292d…

MALICIOUS

PDF

71.9 KB Created: 2021-10-13 01:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e64f5e0de355672b4faa160f01aed24 SHA-1: d863f74304b333b2342af459230c9f4f8cd35e87 SHA-256: fb7d37fe618a292d39dbc4fdf5ddd61d7243201dad5c78650f33c7afa37ffa63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://bolahijau.com/contents/files/pagusisuvulozolevub.pdf In PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/42596694581.pdfIn PDF document text
    • https://network-italia.com/file/furonarinitivugexufov.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/wowikupof.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/ruzakomifilatojitabibina.pdfIn PDF document text
    • http://zuszdounky.cz/files/rogusowojabukim.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/81425427112.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/xalexoxijezagane.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/64020920991.pdfIn PDF document text
    • https://mollis.rs/files/jojijajasuzudez.pdfIn PDF document text
    • http://mcutech.net/files/79093670341.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/jotepab.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/93480880338.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/suxurivom.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/fitolo.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b39539f860---gexafebufelogilolu.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/sirimuforoj.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/89550264608.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/fazojononexizufewoniginas.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614039b88f33b---mifej.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/vofigov.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/15688558132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/Z3ufxtS7Wvw/uplcv?utm_term=identical+in+tagalogPDF 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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 16772 bytes
SHA-256: f91ac8addab67e6606a4dda777bd60a6a37664e09989901619435b20ad3c33d7
font_01_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 10228 bytes
SHA-256: 74a45a0f427b7449275948c0f21e1968cefe092d0b4627fdc469b6d208c93b90

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