Malicious PDF — malware analysis report

Static analysis result for SHA-256 230ce855b0f5221b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 15:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03b456e502c7bfded6ba769c205a7a5a SHA-1: 1c7394bbfdf32d26b70cdbe69f05837b03c1f6cf SHA-256: 230ce855b0f5221b7de741cc8c6b1461cc22995d53d5c01838993ec01743554d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to disposable domains, a common tactic for hosting malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://devcons.org/uploads/userfiles/files/gevejuraxuduzesatagoresi.pdf In PDF document text
    • http://amoy-art.com/Upload/file/xejaxabugojojovad.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/74723904270.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/36534129177.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/woxusitotiketatenemoja.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/pemijivisulakomevuwizeda.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/mewajegifozugugefazerud.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/26579240838.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nisimi.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/fepodamizeparaduwinanuzus.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/kixozuxa.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210907052650_1740378330.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/roxobejiwukat.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/tajubizi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/25318516937.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/33637550840.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/nanasil.pdfIn PDF document text
    • http://elskenecologie.nl/files/18493815661.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/rujok.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/junal.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402734d1a39---fetudomevafizumaxide.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/45005333773.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e98f6b79e---vajowefakepavujaxobubuje.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/pafivukosesodajolijoleg.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/xudotanujomode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+nfl+app+for+androidPDF 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 16836 bytes
SHA-256: d213ebdcc876c63077dc854cc3e70da4a4bcd4ffb8f92eebca7aa2c54b309a4c
font_02_sfnt_off000118ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AB 10544 bytes
SHA-256: bcc555704b0ee425a3900c9a38ebc78523fb6c91f4f8c7618925fe3061213131