Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af9f26f17b05555…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 12:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b6974986f9f4232c1f748903c5281de5 SHA-1: 3bdcd0de877ea9c9d9262d28aba9eea17b46c698 SHA-256: 8af9f26f17b05555622870b1aba459c877b57c8962c241cd0b19b2da18e5b1e0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of external URIs and the link farm heuristic suggest the PDF is designed to redirect users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=wifi+wpa+wps+tester+apk+download PDF link annotation
    • https://badanie-wody.pl/galeria/file/nuroxologilo.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/6211855133.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/25458488010.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/kedinovikipisuvoku.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/mumifebawado.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/28423881362.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/98281376229.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/kifaxipo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gakfihhihv265cgqkkhb8lihmd/figikovagalofamuxanujux.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/39839260868.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/78395920106.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/51814223949.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jibiwawowizeludoxuzom.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/67067888929.pdfIn PDF document text
    • http://partnercable.hu/files/digoxiwaperure.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd95db089d---zasiz.pdfIn PDF document text
    • http://hotechike.com/files/files/45580991271.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/32053648089.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/mevujazebaguduxiwuf.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/pijobimufoguzovuzefuxegu.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/suwopa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///dizumarudika.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/22703031394.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/55191015626.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/14085630967.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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 18796 bytes
SHA-256: 003ee4d422d65eab1709241c3e10070161ebb59b77ab8575880b30fda9f01a4c
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 10660 bytes
SHA-256: 82c2deb0ce2b9bfea731d3a655405097fe3970b80e28e5bb44a45969d4e99c51

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