Malicious PDF — malware analysis report

Static analysis result for SHA-256 4260fb0ebe85e9e2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 06:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e99a7a36f33241507b44be4171e1b621 SHA-1: 87380e8068a0ac181bd6bee4e3c7239c49ba0e13 SHA-256: 4260fb0ebe85e9e2cabf82370654cba81e05e70c0541bc7a41cbc8401d0ea3fc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan variant. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to engage with remote support tools, a common tactic for social engineering attacks. Numerous external URLs were extracted, suggesting a potential distribution or command-and-control infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=example+of+productivity+application PDF link annotation
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/16047628250.pdfIn PDF document text
    • https://birotex.rs/images/files/76314126687.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xanobanifetulanosi.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/204037947.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/xisepelup.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/xukegupetopogiwerepo.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/zexaloji.pdfIn PDF document text
    • http://micruts.org/userfiles/file/momurudinar.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/sufefakutawefubilurivin.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/30757158420.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf36e7044---92915101529.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/98103212544.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/53818076194.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/xesiwokipobiremujuro.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/zunur.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/19010243323.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/57266527639.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wituvaxeranizo.pdfIn PDF document text
    • https://jjpremiers.com/files/gulibatikizu.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/nudata.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/22381651364.pdfIn PDF document text
    • http://www.siposferenc.hu/html/9872996228.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/37109798659.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210912151601.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 17748 bytes
SHA-256: d5dd3cd58f06b21e34ad90f3e67cf2533204581e7ae20ca7f86178a083902f37
font_02_sfnt_off0001255c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255C 10980 bytes
SHA-256: 33316ae39a60304ebe60b210f894a4a6f5ebeeee53b153ad027ad79a6066d96b