Malicious PDF — malware analysis report

Static analysis result for SHA-256 453ee975ca4bd3a1…

MALICIOUS

PDF

114.5 KB Created: 2021-10-05 18:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc8e271039e34b1929b8f5da5b4f4d74 SHA-1: 824b503c8dd5eed088d5e1d87bcf19c2990ed603 SHA-256: 453ee975ca4bd3a1a9d1adf99f13aedde1bc885c329e21cbe85cf92653d84bab
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests a primary purpose of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=08+ford+f350 PDF link annotation
    • http://i-harmonics.com/upload/files/zeletinidiwarine.pdfIn PDF document text
    • http://homeopathyhk.com/files/128297168.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/13203481770.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/fuwewudodiwivimo.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/80078711594.pdfIn PDF document text
    • http://fitviewer.de/files/file/povotulepubafo.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109170206502841.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/25977009655.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/weperojavulolesidof.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/80247192533.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153b9796f698---91977379753.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/talovimade.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/xotowigewab.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/69515306830.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/mugirivinebufojomilazasa.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/70583122817.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/sejorik.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/tewenirodozupadifagigol.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/vorutuxejexagavufel.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/95185772812.pdfIn PDF document text
    • http://lg-palette.com/upload/files/54998386626.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/48097f11838e346664d9d05915a2aed5/57044117601.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/45546702690.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/8729127566.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_off00015995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15995 20124 bytes
SHA-256: 0131f856c332c8be82d55264361224cf0c73d561c37053c8c4ecb3099d50b637
font_01_sfnt_off00018dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D5 10084 bytes
SHA-256: d637ee10ee3edcf15f64f53e93071ccc83bb639b9ca02b17819e5db28eed096c

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