Malicious PDF — malware analysis report

Static analysis result for SHA-256 f326d581cbab2201…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 15:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ab962ecca0b237534586bde060def98 SHA-1: cb3415f3f51d85e3c0423f4c5d49b984e3b18f46 SHA-256: f326d581cbab22012647df7fbc509d2cad79012f5b9fe79ff1dec7f12fb18e3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection scheme. The PDF structure and embedded URLs suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=words+on+letter+d PDF link annotation
    • http://somkuthyoptika.hu/editor_up/90520830362.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/dizewizomoneneperuxeg.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/juxov.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/90104682176.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/39101020061.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/jositanagevix.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/98058782099.pdfIn PDF document text
    • https://superchills.com/userfiles/file/mijafenupiket.pdfIn PDF document text
    • http://naviway.su/upload/files/gomasi.pdfIn PDF document text
    • https://people11people.gr/uploads/File/97242240168.pdfIn PDF document text
    • https://renetravel.ro/images/files/bagux.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/25105783201.pdfIn PDF document text
    • https://edusfera.pl/upload/file/jukebomaladav.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0c78a609041fca5760793aeae22b80da/sizemafenidetolafif.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210912180244.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/xatoni.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/93610982545.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/pabuf.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/sowog.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ad168da4aee8fa4e05c9c844f96de4c3/46680612162.pdfIn PDF document text
    • https://ottopianos.nl/files/diredoxenujotuga.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_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 9980 bytes
SHA-256: c03f38250ac7f938515ba807ab8b292ee8d5b947afd569f1836ab814eac8b64e
font_02_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 17424 bytes
SHA-256: cd72c1786f351f29cf65a39241defc85018b118bdf6dd12be596054e1e209a1d

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