Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54465e7e3860e13…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 14:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58521322f0ea4531f0c6e729868868a9 SHA-1: b68f26d866a17bfff1f1d6d24912e47aa8e4cb80 SHA-256: d54465e7e3860e135b74145bd47eb589baa0de2c631350b6d148cb2ad49d198c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=how+to+draw+a+chinese+dragon PDF link annotation
    • http://evola.it/userfiles/files/24974069633.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/37863900083.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/92630849071.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/powulewediki.pdfIn PDF document text
    • https://e-room.co/userfiles/file/31056312651.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/buvudomajovuj.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/58831803342.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210911080313.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vavinopu.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/69118304149.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/fced6a1d2a01bf1c0641233135cbaff8/vetubamam.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/32419489607.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/91150511088.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/rixojakaxevita.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/velatavemubumox.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/selugugo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/g7je2r4fl22rd1p7hnlr0snprk/rujilutipo.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/gegipibiralomibaw.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210902090001.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/3402955489.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/nozivapekofovadeximila.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/vizedetaxafib.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nobaduzekukejebojuxubov.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/bopodol.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210912050337426.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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 10680 bytes
SHA-256: 5edd79f18b6c8eb45e09820ca3c0ea4bb26f3638fd70090690f5e6253627b92c
font_02_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16660 bytes
SHA-256: 4e44e0f1231d0bc43f990aadff26d0b0681d6a2e57f07d729e52d76f34c08279