Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0132a8de78bf4e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 19:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a58c50e41a23d0498b8e52dbec88c311 SHA-1: 7a6ac461a5d3639ac685fb9fb56efadb59aa8e88 SHA-256: 4a0132a8de78bf4ea4673bf2a410a0515232f7a311659a757880e9e4548171e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mcenterdk.ru/fck_editor_files/files/biwamifufivugefuni.pdf In PDF document text
    • https://gizaviation.com/uploads/files/wemodeporixogirukepisax.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/60924755562.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/toditeliw.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/mifitemaganajisunizonuxor.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/64785808789.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/87281076197.pdfIn PDF document text
    • http://santeh.md/img/files/wajijimole.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/nejetibefofesumuzu.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/31923805098.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/45040047072.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210916_CBA35BFC31C34C48.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/zabesonumew.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kegimutum.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/xurebaliwidazuzukusepe.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210915200109.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161338d4374d09---wuziluzuduwizodum.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/5009762969.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/disod.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/zomubodeduv.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/18876645500.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/wolilotukoxev.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902231712581442.pdfIn PDF document text
    • https://irantruck.ir/data/file/33495000466.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/nifadizewibomuketoselo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+my+wifi+not+working+on+my+android+phonePDF 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_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 11184 bytes
SHA-256: fc45d23c37a85fb96cbd9042040800cba3b36821fa4c3453e9c36bdcc5d0caf4
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 18020 bytes
SHA-256: 4a749a46e3bb194a9f8c2059a933610f41c611a89d05f362c9791c8205f26151
font_02_sfnt_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1