Malicious PDF — malware analysis report

Static analysis result for SHA-256 243092ecfb3d4605…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 20:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41b8f4f7eadb23bb2efa999bf13cb974 SHA-1: 6872f6e235b8a638d81b4c4e32fc4d9761a5c265 SHA-256: 243092ecfb3d4605dcac2d3711eb295a219851915422ac849af854f1321de309
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=ls6+glider+for+sale PDF link annotation
    • http://www.salpasafarit.fi/tiedostot/files/8495873998.pdfIn PDF document text
    • http://ertekeles.diakszempont.hu/userfiles/file/xobosijolog.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/lavubepufasena.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/72881248122.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/39867432322.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/jinofozuvub.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/wagawe.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/xixerirativomojugadigawe.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/jivudozofilij.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/melez.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/fupupo.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/sadome.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/xojagiwovapalolined.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/93063126623.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16149748b424d0---85076405446.pdfIn PDF document text
    • http://szm.hu/userfiles/file/kuvigoxuxe.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/63851835305.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/vowajitotixudulipi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a3900c42e85499329de64415ffdfc6de/92626701903.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210902223306.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/14551496126.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_off0000ada6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA6 19644 bytes
SHA-256: d91a2808c20800ae938c600a16ac338e1e97644644a8b27ca30ea1523ab118f3
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 10452 bytes
SHA-256: be36348906d76d730a7d8b8aba65fbc80fa3af02586293f28f19d3d107be5ae6

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