Malicious PDF — malware analysis report

Static analysis result for SHA-256 2625659cb9f38989…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 06:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e63ec1be71e68c6794446a8505935584 SHA-1: b9065120e45984b82ee18379ef3296bfb5611a29 SHA-256: 2625659cb9f3898954ae7ff5b00aedd2c75c20b8da0ba47e8807609fa5ad10c0
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs suggests an attempt to redirect users to potentially harmful content. While no scripts were extracted, the overall structure and heuristic firings indicate a malicious intent, likely related to SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=rules+of+survival+hack+android+2020 PDF link annotation
    • http://seghers.kr/data/editor/file/107388737661349217afabe.pdfIn PDF document text
    • https://faceless.me/userfiles/files/zipuwobubuluj.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0aaff317d---jawojuxogotape.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/visibisuniguzurofi.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/10419588106.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/69596986467.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/zedubugajexuxerizatofim.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/tonifuvuxib.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/ruzijimesapowojalirugo.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/dupolowizawezirakawed.pdfIn PDF document text
    • http://traviet36.com/upload/files/6990593653.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/sasadixuve.pdfIn PDF document text
    • https://miet.hu/kepek/jedevusivuzabijimimimoked.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/35225714501.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/9583787948.pdfIn PDF document text
    • http://snft.ro/media/file/tokukirokepitatugi.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/pesazen.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/navategesokunanikos.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/bediwujusa.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/10862556254.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714aae5092---58191490611.pdfIn PDF document text
    • https://raljob.com/userfiles/file/97119412671.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_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 17488 bytes
SHA-256: 78e3388fda1a9233d435934151bf09ae228509be0c41765f3a9c090872199440
font_02_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 11020 bytes
SHA-256: 55847b26b0040befb3678c56352515996c21adad674441fcf29cbe1bc4f37e01

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