Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f98f353dcf3bfd3…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 15:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec13e736fb07462311d92ac8128c762d SHA-1: c59ec29eb95107077697c5e5cfc2db4aa931d6a8 SHA-256: 5f98f353dcf3bfd3b3d75e8b80a6d9865850a0434eb6c10eb9f17ac1dfa508ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=keeping+up+with+the+kardashians+streaming+season+9 PDF link annotation
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/kuladosozilemof.pdfIn PDF document text
    • http://slovoveri.org/userfiles/609238291.pdfIn PDF document text
    • http://0048.pl/48files/file/51754941575.pdfIn PDF document text
    • https://hgb.se/filer/file/rexogiratusajomijokokitit.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/sevibusuzadixi.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///livosutuxu.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/42180056795.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/242613533.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/83942190504.pdfIn PDF document text
    • https://unosms.us/userfiles/file/24758197266.pdfIn PDF document text
    • http://ossokahve.com/upload/file/luwazimanozulupi.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/dudegaxokigusit.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/59375746466.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145221f0c83d---nikodag.pdfIn PDF document text
    • https://upaspor.com/resimler/files/topom.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_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33B 11232 bytes
SHA-256: 91edb7af4fb2557ff987a1cc439fa0a2ed575c63d6eeb693332db899238011ac
font_02_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 18180 bytes
SHA-256: 9627e53a003943434856af1e6b5ce1268ffd75a038f1fd8cbf4f552d3fc62382

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