Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c24a2571fb09e2f…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 06:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b21e00870d7a0de5d8b9c3f5bd2122be SHA-1: fb0c4063cc537ed7ad9f8bc83405daffbf344049 SHA-256: 0c24a2571fb09e2f93507a9a8f399d9204f9e1961c4a07ed0bf5d6bbc3013d0d
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install remote support tools, a common tactic for unsolicited malicious documents. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://dansensvenner.dk/imagesfile///90727161769.pdf In PDF document text
    • http://onfireinteriors.com/userfiles/jigamavuderat.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/57553505591.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/nuvomonokazepugelemukeset.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/besuxejujaluxipejuvosefi.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/sekufevajoxepuwaxop.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/13470559265.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/86829217374.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/21981742422.pdfIn PDF document text
    • http://szm.hu/userfiles/file/62586108582.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210913180345.pdfIn PDF document text
    • https://norservis.cz/files/files/zowetif.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/kapopunulodagokuna.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/lavopexoxamatozefibuvi.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xagetig.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/ropivagozok.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/20529027623.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfb4e2b36---89301782241.pdfIn PDF document text
    • http://armanetti.com/images/84318263555.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/kukupuxen.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/47187865797.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/geroximupefi.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/riwutafupelusesuj.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/37194589461.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/34343706760.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/87758892060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+root+smartwatchPDF 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_off0000e9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 18816 bytes
SHA-256: 7a042a768346e96a796de624fb3611e432a78ecbe1f4a74660606335b8f031b1
font_02_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 10200 bytes
SHA-256: 5fa6b984e1d49e551b687a4b7343a99d4eddcb0612aa3671ac195fb2eb2c157b