Malicious PDF — malware analysis report

Static analysis result for SHA-256 f570e0f1eb8a2a7c…

MALICIOUS

PDF

72.1 KB Created: 2021-10-02 16:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 338fc0454d69b663832baf9ee5d04d0b SHA-1: 237e88d5fc5424fdac5109b49f2b9deaa54ba004 SHA-256: f570e0f1eb8a2a7c0bf0ff0a544a9a76f8d790d83ed1aaeb99928ff1517f5dbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=what+features+of+both+the+virginia+plan+and+the+new+jersey+plan+ended+up+in+the+constitution PDF link annotation
    • https://likeevent.it/writable/public/userfiles/file/29741921774.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/86379838579.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/vokoxuzepara.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/raramolidisegilosofa.pdfIn PDF document text
    • http://hotstamping.pl/files/file/vilitagi.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/lelugokusotisuviwoz.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/62470048729.pdfIn PDF document text
    • http://bamila.vn/luutru/files/wikag.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/87281324479.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390108db059---91309504048.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/sosexojusokojizadov.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/ralofiloli.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/31639379052.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/zewifa.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/36486228179.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/kazasezufakukuxubovedape.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/bewejodevipakimuk.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/jinuxafupijilodododideme.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161367e810d4df---77250684528.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rasojanuzufe.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/xuzatupeme.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/jodaraloru.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/66957679343.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/96686005256.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_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 11528 bytes
SHA-256: 8c44d6ddaaf917012d4fed8f2a51c42a807c67d3dbdae1094e680ad617849c6e
font_01_sfnt_off0000cf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 16728 bytes
SHA-256: 5f3f8d59bb1eff2b2f376d09406c42cd9b62df241d1400681942c2978bcef6fc