Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e3db95dc740abc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 06:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 535397435470041b2dbc58adc58bdd94 SHA-1: 1768938b8a4184b126a88bdbe42f8d508429ea33 SHA-256: 02e3db95dc740abc9ca676f40cc0167044ac0a521e4c82730ba855c6eabafc56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using numerous links on potentially untrusted hosting to obscure the true malicious intent. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=usar+movil+android+como+webcam PDF link annotation
    • http://studio-orlandini.com/userfiles/files/gepinumirosu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5c7689b7---zizonoran.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/jimiguwerejojanemi.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/38558460377.pdfIn PDF document text
    • https://agatanorek.com/files/file/7848137927.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908101755.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136160a14d27---11923980564.pdfIn PDF document text
    • http://taigesw.com/upload/files/fojuvogunesenuwimil.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/tebomiguxevarememek.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/39521924014.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/bigitasifumubosa.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/xipumetenetetote.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/lafural.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/45515737689.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/burexewazejujazub.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/48351119141.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/94764813296.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/70554250465.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210920114848.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/7678167973.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210919050648.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/42371691641.pdfIn PDF document text
    • http://onelove.cz/file/10985218297.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/tiwufisezijobijapefasij.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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 18576 bytes
SHA-256: 424a5018278cbcccb40e3f7074a79ee416a22a70e8671a81bbf4ace913914ed4
font_01_sfnt_off0001099c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B3 10732 bytes
SHA-256: 60bdd7a9dca29663889054aebd97f30a3593f64c09006ac8778e0098e04d1cb5