Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f016fd87ec1c5e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 20:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05daf33aee16f039c5b5ca2cd99ddf01 SHA-1: 98ade572a427eb4657a7cdc3b4bb6939caf0e762 SHA-256: 26f016fd87ec1c5e174702138bc00e6595a87e1e7c3317fbdac47d1a971f5386
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URIs indicate it is likely used as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=f9+full+movie+in+english PDF link annotation
    • http://vytvarnyobchod.cz/UserFiles/File/50820137744.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24e36114c---fowozu.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/98732951885.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/2388388994.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/82214766748.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/jakoxiridiwimijoresulo.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixabiwopiwexuvoxol.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-9/20210909162248994996.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/41012570973.pdfIn PDF document text
    • http://freestyler.cz/img/file/nivolirore.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/wixemepotesasibunep.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fudegigafalupodanasa.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630970530.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/kasidusogu.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/sajuni.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/37711469673.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mateje.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/zavaxoboru.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/78910315878.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/difiwo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hlsqig2cuut10jvkf7b92gb288/66356470415.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/84887449931.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://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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 10612 bytes
SHA-256: 8461fd2bd7214a682703b081a85eac13cf9f997e5875ee34c42eff651a3f2481
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 17952 bytes
SHA-256: e65d933f032338d4a1e934e65b6ff55bff2a5f3b87dfadcd7d0f10fe3e829c9c
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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