Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa1af7cd1c363ea…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 07:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 28e9e69cd7f1f027679ce2f03c84f0e0 SHA-1: aeecb4e88a810cb6219f02d62d41fed5b6562345 SHA-256: bfa1af7cd1c363eabde06c87d1754d0105e26c4319d740a3d0b23ef8e5eeb476
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious or untrusted domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://essiac.cz/UserFiles/file/kituvo.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/20e04dd70542ea3118e9fa527ca2e31d/vojaromikefajofagul.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/64992661026.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/28930279182.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/19659592193.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/nikulipufimeduf.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/48557576484.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/68525064126.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/revimoxufadeneb.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/pimusutix.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/voxam.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/79065821627.pdfIn PDF document text
    • https://bak.vn/upload/files/37696297097.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/77578180473.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/widebemugitotafe.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1562026eee3b5a7fd814b9c902042a49/57513105179.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/resudobokabata.pdfIn PDF document text
    • http://goref.ru/files/file/kesabafupivorawarurajamu.pdfIn PDF document text
    • http://modero.vn/upload/files/sukipijanemeg.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/32178532194.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/polug.pdfIn PDF document text
    • https://olterus.com/contents/files/towovagewogukoj.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/83559516808.pdfIn PDF document text
    • https://kokomanis.com/contents/files/72363275775.pdfIn PDF document text
    • http://uchid.com/uploads/file/loropebawokanukolubezezij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=super+mario+bros+flash+unblockedPDF link annotation
    • 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_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 11196 bytes
SHA-256: f76d3911fe052071675c9fe99e3fc0326885897bd952a2ad7e13a7bab70c26d6
font_01_sfnt_off0000cee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 17424 bytes
SHA-256: ed9367b4397bdc33521895dfa772f6281660067329bdb1d56a9c592e5079236c