Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86dae4011a9256f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 03:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 392202d62210eb4df4a67b63841be3f5 SHA-1: fac098873168d9a2bbd6a4ea7421fccc4231498c SHA-256: b86dae4011a9256f636ac4938a2f71f31ee2e604b00576fd0b47a7aaf5f80fb6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files, suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=streaming+film+harry+potter+3 PDF link annotation
    • https://firesystem.ro/imagini_ws/gupofatigige.pdfIn PDF document text
    • http://bresky.cz/res/file/82448321714.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/67753175459.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/83031515456.pdfIn PDF document text
    • http://www.agot.pl/upload/file/vasaputugoxe.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e306188861---47286352317.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/molefukavip.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/15988310536.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/51626282620.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/59077550144.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/gasem.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5d84f1341---50724212254.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufoxigafoturisa.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/litoruf.pdfIn PDF document text
    • http://kme-kme.cz/files/file/rovapedunu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/gosovato.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91723576906.pdfIn PDF document text
    • http://teifsepahan.com/files/file/sorepolexumepudabusasawi.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/49317499404.pdfIn PDF document text
    • https://eguiders.com/uploads/noviluwewizuxeziranuwur.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/88625104767.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_off0000ac33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC33 15840 bytes
SHA-256: 1fa129e5859122df05ba185ff20be8b1145691280eb01b44505e1514550f67b9
font_01_sfnt_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 11000 bytes
SHA-256: 823afcc1639c667a491fddf4eef85a3cf32b6124f88af0703bb1737d7e48a529
font_02_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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