Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f04a63cb3aaa59…

MALICIOUS

PDF

71.4 KB Created: 2021-09-10 20:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b954523e6c3c06631992277bb5a9485f SHA-1: 46f11b3be49097fb8d4b3729fe726f28c28719e2 SHA-256: 86f04a63cb3aaa594de7735e235089dbaf1fc8af9335b904e862b4dcdc2aa8e1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://circuitvietnamcambodge.com/hinhanh/file/11506425799.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4u6cuquij69lgih1aen1610mj3/82718412205.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/kodejugi.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wanusof.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/wofafej.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/35306228140.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/16224925396.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/33113687729.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/33982837705.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/55302790989.pdfIn PDF document text
    • http://imoroz.by/upload/file/20497640408.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/2204294223.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zavasudo.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/vajubokaroxotewifero.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/ziwusafiseg.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/laxuxukevakuva.pdfIn PDF document text
    • http://roocenter.ru/upload/file/29121071010.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/23154860384.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/19390029807.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259739040d---79949404266.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/salikaxowigagesomemowu.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/dikirorog.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/nuxaxapilomifuj.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/67316208306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=roblox%2B%2B+app+download+androidPDF 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_off0000b6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AF 16556 bytes
SHA-256: 75ec8d88d038930a61e673c925a8ca53cf7df5e2ba8362994ec61a872fcb59c5
font_01_sfnt_off0000e0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 10360 bytes
SHA-256: 47c9f79a20619a2586bd2e11496ba1e294e101bbe547bbfe3474595d2f741e2c
font_02_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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