Malicious PDF — malware analysis report

Static analysis result for SHA-256 1accca939a6c5966…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 06:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3eae17129082627965b743d856053884 SHA-1: c64081e739269722d87e3d0ed042ebc138bbfc7d SHA-256: 1accca939a6c596612483e900b704488779326af1091778a75d320bb178a9619
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install remote support tools, a common tactic for gaining unauthorized access or facilitating further compromise. The presence of numerous external URIs, many pointing to PDF files, suggests a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://laborke.ru/uplcv?utm_term=remote+control+pc+from+phone PDF link annotation
    • https://diamond-marketing.cz/soubory/rimeropusawowobisiga.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/nadetolofekudasi.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/44490140813.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210901_171054.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/tepukati.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/66521808866.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/84780051552.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/desiwowuredoremutifanuras.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18095908399.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/fusof.pdfIn PDF document text
    • http://edeins.com/userfiles/file/20584402923.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090122535173499.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/romutalot.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/newajapixopo.pdfIn PDF document text
    • http://pololanna.com/user_img/files/zuxiwawedimevusosiwofofe.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210903121211.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/mudiloxokupajejepajuvubi.pdfIn PDF document text
    • http://leeandrewdavison.com/download/73204831309.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/didaxeja.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/bedigeluzorisi.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/21188468338.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/20737992653.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/37261668915.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/revogitimozoro.pdfIn PDF document text
    • http://synhbio.com/upload/files/rewiruzemarujusukoluj.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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 17304 bytes
SHA-256: 953e45306a2a5d9b1c84dae3d528c5ab78f86dbc9f6a56f89926436b76a6bfe8
font_02_sfnt_off00012c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C65 10368 bytes
SHA-256: 955ccadf79b5e4034f747f18ea682c78fc1301b0a3accb8ebd34b5cd6b6c9a89