Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d6da28e6cddf92…

MALICIOUS

PDF

83.0 KB Created: 2021-10-04 16:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a001d77c528cf70259293af219893f61 SHA-1: 77d69bae224238b1b753fd7a5252e869dd4c1bd8 SHA-256: 98d6da28e6cddf92c71eef80e3cd78b6e92cd570b4f669c49992a63bb96109ab
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+brass+turtle+lodge PDF link annotation
    • https://sreekanakananda.com/ckfinder/userfiles/files/nowawexer.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/fexofotowulidaweratag.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/mugodofozudu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acb61b84b---fesidevotevezereduxora.pdfIn PDF document text
    • http://synfarm.com/upload/files/51956178558.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/juxowefowivelenafe.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-10-1/20211001085322369429.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/94693628969.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/28959261202.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/xerubivubak.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/2670163156.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tanadezasefuvim.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/potewofegeselorofevoribi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/jiforivoj.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/rajisavijamil.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/raferelel.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090432459673.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/5069170478.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/17990189481.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/wifurokoz.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/mivevulurana.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/wiwejuvalewenewijuloko.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/rigutefibolatajitiwef.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/tipidibuzesikewivizalon.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210923_172508.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 19040 bytes
SHA-256: 2f84636f4e4613bad4fa833f6820af11d09ee493f88c8f0a984d055ac24da145
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 10532 bytes
SHA-256: b9a07a91d1d6bdaa7279d8f41538374171cccbc396c10feb07e8cfb86f1ddcd3