Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b11c38790820139…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 12:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ff1ba11db84f42d8159b116b9ecfb0a SHA-1: cc7f0d7acfc586b7bb11c92fd2e8379ad88a89b0 SHA-256: 8b11c38790820139844212aef6ef5d6740cd03b394b9eb6bb74453d81b0f915c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The presence of an embedded JavaScript stream and a large number of external URIs, many of which appear to be link farms, indicates a strong intent to redirect users to potentially malicious content or facilitate further compromise. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=mi+10t+lite+geekbench
    • https://speedwayinfo.hu/uploads/file/86483870536.pdf
    • http://m-styleauto.com/js/upload/files/53976630566.pdf
    • http://jj-metals.com/userfiles/file/2021090913565873499.pdf
    • http://hyunsin.net/userfiles/file/batetaz.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/47752642413.pdf
    • http://climtech.com/files/files/28333108925.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/paloxus.pdf
    • http://didopack.com/files/67486558010.pdf
    • http://brava-ekb.ru/userfiles/file/watavavawimukesobuwisa.pdf
    • https://cochleartudaskozpont.hu/files/jejobekenonekobisuwamapa.pdf
    • https://china-glass-mosaic.com/userfiles/files/20210902_075331.pdf
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/butefibubig.pdf
    • https://tranhdaquyhn.com/uploads/news_file/91523134694.pdf
    • https://nhahangthanghuong.com/uploads/files/86510489179.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210914054634.pdf
    • http://skmsm.com/userData/board/file/filaxup.pdf
    • http://agriturismoilnoceto.com/userfiles/files/xuduwewerozelekeme.pdf
    • http://baggiez.net/userfiles/file/pugezejumofitexosimu.pdf
    • http://avtokit116.ru/!upload/files/1789870101.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/29527010098.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/2120485761.pdf
    • 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_off0000b0ba.bin
36ec4c8ffa2920522bef42970dc06e5548b924e5c09beb1e159bd7e5c6f293f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BA 15628 bytes
font_01_sfnt_off0000d899.bin
82e43e6e88a6e969cac130c91b68b6806ff745b047f81dc3aef619f1694fbe31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 10356 bytes
font_02_sfnt_off0000eff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes

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