Malicious PDF — malware analysis report

Static analysis result for SHA-256 6407d9627b7fa50a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 10:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25155a4f3fe3c11beda3f3aae2d98512 SHA-1: 76a7273437cfe0aaeed3bd063e87782147e75a89 SHA-256: 6407d9627b7fa50a4bf9bd6482985fe78d53e4e6e1da405b118538112e23a128
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs pointing to various domains, many of which appear to be disposable or link farms. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed to redirect users to external, potentially harmful, websites. No scripts were extracted, but the sheer volume of links and the ML score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=notruf+112+apk+download+free PDF link annotation
    • http://madiagranitosilano.it/userfiles/files/movosixes.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/12384695302.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/87899276332.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/dusafabipufelosabixide.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/fovuwavufun.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909010030363029.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/84447085404.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/98417057000.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/21272569823.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b9a94bf8---zuvolapivojesudumizo.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/putanajosonewi.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3125f7f68b26e89b40f19b361deaf7ca/sumabapajemupotulufotev.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/23072721749.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/wagoxuzunaturiditaveluluz.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/64074534597.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/21048846055.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/desozekufizubivetub.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/kepevolufok.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/44626292923.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/36067474318.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/32678930956.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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 18916 bytes
SHA-256: 3b226760e86107ce411498dae67f7a390852f70c428e2f5786222f93194649c1
font_01_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 10660 bytes
SHA-256: 2611ebd0ccdabba234ec24cc1e457827b85c5c8b4a32f904e702aa17b594d19a

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