Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2f1038798bd8cb…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 17:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f1bd504e2e986d4abaa8b0e918c9d88 SHA-1: e044e5d5c774d9a21796a351064eb372b24cdbe1 SHA-256: fc2f1038798bd8cb6d53fabbed76d5f19ea1553753aac7166ad3726713544ed2
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to appear as file downloads but are instead part of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://shinies.ru/img/lib/file/lofosubusur.pdf In PDF document text
    • https://pezenasenchantee.fr/userfiles/file/vazew.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/71270481616.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/sejasuxopajiwazozunozu.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nejepolutikenemijedek.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/jabamika.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/rebagorufazojis.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nutuf.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/4090526133.pdfIn PDF document text
    • http://ge-mak.com/files/babosonuwa.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/40505875881.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342af8dd8f5---finewikunez.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/69964576928.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/56950278446.pdfIn PDF document text
    • http://harlit.com/upfiles/file/gefulawimurekupawote.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/51919398442.pdfIn PDF document text
    • https://agatanorek.com/files/file/52832089959.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/96753766595.pdfIn PDF document text
    • http://belv.ru/userfiles/file/wafik.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/borexutugefozozosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=convert+spreadsheet+to+pdfPDF 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_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 15520 bytes
SHA-256: 23b800f82d920bd1625f9c4d077a0136c08590304b572b003d72ee967de56b15
font_01_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 10552 bytes
SHA-256: 086f2ea764771dc0ab8eae7eb811189f3b42f99f20ce4ab70a0ee7db66956f60
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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