Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec69e05c4756bac8…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 13:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17ff557387fe510ebca62c29a23b1e86 SHA-1: 9b26366ab971df1609d6fdbe996bf486cabc608e SHA-256: ec69e05c4756bac84c0e3213c1a64df9f87ca7f0b74686a2758dc4d2bb643d9a
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its small size and image-heavy content, typical of a screenshot used to hide clickable elements. The document body is heavily obfuscated, but the heuristics and numerous external URLs indicate a phishing attempt designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=i+drink+water+but+am+still+dehydrated PDF link annotation
    • http://tomboy2.com/images/library/File/84924126746.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/rikotalobis.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/57752074459.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/90321813360.pdfIn PDF document text
    • http://poorclarescork.ie/images/dipesowesoperaxuto.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/44748461429.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/22/file/20210922_154144_181.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/27126701176.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/39561495173.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/79332927118.pdfIn PDF document text
    • https://shunnasato.com/98884817295.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/birugibafo.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/11902124981.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/90197544780.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613924009e863---59378243218.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/15981483637.pdfIn PDF document text
    • http://kim-clark.ru/files/file/mogikexoj.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/dotuxuzekulowafurunevibi.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/wezaremuzunodago.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/27708297652.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/fotuxebok.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/xufefafafufokokej.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/85458903206.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/45605891949.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_off0000ae22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 13920 bytes
SHA-256: 8d8a64076dc7840e35c0acfef037ff1a8fff2ecea668306582a216c604d20aeb
font_01_sfnt_off0000d09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09A 10876 bytes
SHA-256: 780790c885d3f95e960fc13c08d66fa4c81e1c14277e0c818960ec14b21e6fb9
font_02_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1