Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f769b4c1096b0fb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 12:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b483b1cfff48f32d1ba732a26cdc4dc SHA-1: f6783fddfea52d006d80783850bce7748d850530 SHA-256: 8f769b4c1096b0fb6b187fd0e886ad21c289f26bfb98925d15709b205ba859b5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external links, many of which point to disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

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://xn--atpta-nfb.lv/images/userfiles/files/tegifidadonanitajaxafifa.pdf
    • http://didongsinhvien.com/upload/files/42778923903.pdf
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mazob.pdf
    • http://awfiowv.love-mrt.com/upload/files/ziferepuju.pdf
    • http://location-appartement-venise.com/italie_documents/files/ruvidodapovukotenemujilir.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/wazodolakiwi.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161339744c6336---petigidove.pdf
    • http://kapelski.pl/userfiles/file/mesitejelapufik.pdf
    • https://bursakaynak.net/userfiles/file/julosukufefaliv.pdf
    • http://lorichphoto.com/pictures/file/wibipa.pdf
    • http://langyupharm.com/upload/files/21630053259.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/sufivujusazos.pdf
    • http://findusafranchise.com/files/files/79275709782.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcf82c4cb---nirixokagelu.pdf
    • http://www.jasolasia.com/image/upload/File/46325507173.pdf
    • http://bankerz.in/qpic/files/risesisurefidumesatemine.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/lowimujosibinusivalav.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/38110620428.pdf
    • https://chennothinterios.com/uploads/file/joruv.pdf
    • http://seibyou-koujien.com/files/files/movosasoda.pdf
    • http://baominhlabors.com/upload/files/roletunujixemanosilurune.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/dawuzuketopobowokolixok.pdf
    • http://whatcanidoforyou.eu/publish/file/xesokukulawaril.pdf
    • http://pasted-radio.de/web/files/nurizurepogatupome.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=alarm+app+download+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 16792 bytes
font_01_sfnt_off0000d4e4.bin
06305472a86a9811997b084fc4ea7d68b1e1dc1d62e6d3e407c4a23f6720cb94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 10328 bytes
font_02_sfnt_off0000ec19.bin
1f460acd39e1a09f2879076b0d20f35c85dcb305b6aad2a2bcbc8fcaf33edde2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 16884 bytes

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