Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e10aaf35bbe591b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 11:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9de082c47cde046296a6c0f5a249b5c3 SHA-1: a07a2d72b01a1c0361e38b9f871da20f319c545c SHA-256: 1e10aaf35bbe591b2a1603efb8808726b9ed48f6c6cb90c2052100a5fb045647
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drbumbnursinghome.in/ckfinder/userfiles/files/68509025605.pdf In PDF document text
    • http://studiorumeo.it/userfiles/files/nugitat.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/37264435170.pdfIn PDF document text
    • http://metallpress.ru/files/25223317260.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jufudarogipiz.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/91368358833.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/bamuwutizasetetukabe.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/wepudedexufilu.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/86367049865.pdfIn PDF document text
    • http://poliinc.com/upload/files/zofolitog.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/fulubilusefetaxa.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/40279686592.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/16784893843.pdfIn PDF document text
    • http://eternoohydro.com/d/files/93294953388.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/71721429010.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/vexazogufe.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/gisosa.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/14403612823.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1a859b34---jadevutolip.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/4552140524.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rosabiropejorijan.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/xeruvejosavi.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/77437070689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+orm+for+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_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10524 bytes
SHA-256: 3a4d2e7ba5688a45c573176a4a24b8bb35b2cd2bba128c26bfbf7699ff5ba38a
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 17452 bytes
SHA-256: a6f80dd2136ac38ef20a87ffc1b63533250d561df704e534af8d43c189f008b8

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