Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17afdd5fcb860db…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 12:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbf487d9d4aa243cebd182006147c575 SHA-1: 3a1d075f8826ecc432f819b2deacd8c48bd52024 SHA-256: f17afdd5fcb860db316416a0c27b66937e2001d1d9b651f7555333e2d054c87b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further payloads via the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=autumn+fairy+tale+eng+sub PDF link annotation
    • http://honmamon-s.com/img_seminar/userfiles/file/96403345645.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kuxofanumaneluvaw.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/68554837663.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/50653785209.pdfIn PDF document text
    • http://chineseclothingonline.net/File/woninewasafizelejanifofo.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/palawerejekitu.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/90839892256.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/88572824811.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/buwokutuxas.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/37380694988.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/33276264760.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d931a588d---pimudopobewu.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/96884941648.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/13521042037.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/lobiw.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/75268917629.pdfIn PDF document text
    • http://eventechsite.com/files/files/52961128610.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/31758146203.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/7636356376136f6b4cb418.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/fudomojenuxumagipuji.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/laxovivap.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/sodafikegiwos.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/lizafurudaxonek.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_off0000b170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB170 10772 bytes
SHA-256: 23f0c661f523ef4a1a2cde6b2aaec28eb6cc4ddd0aaacab40d7184ca37ab40f4
font_01_sfnt_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 14536 bytes
SHA-256: 6b6e6f61fb56f742d11f38feed544060d509075eb50de450aff71a5efca0517a

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