Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec17a5196cbb616…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 02:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 493156ab6d14dfb2dae44003199aadc7 SHA-1: 1251660054cbb137553fc48d34d59b162782a7ab SHA-256: 2ec17a5196cbb616a300912f03143f67e4a142be4868a2d359797304476cbfda
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=full+movie+justice+league+snyder+cut PDF link annotation
    • http://nhatngungoisaoxanh.com/upload/files/95883162390.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/85556326680.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161409f1a56711---kupapef.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/givovaloka.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/sogowamukuwozuvudefa.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/talumez.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/gegogofuvananax.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/34396095595.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/berabebajejevutigadiwiza.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/dovopinalisu.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/55209993906.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/gidojupatewalafovef.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/miwor.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/nixetabuzepilewo.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://ahrestygz.com/userfiles/files/20210905_064742.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907031057253408.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/76948100134.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/77013949721.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kogelibafegep.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/77437070689.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63eb5024c---1639666885.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/79313407354.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/92615627469.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_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 11100 bytes
SHA-256: b6cfd638d55e7719a3f375d4a9c47ee3ee55936148b06e01728f7d8bc4c46f21
font_02_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 17904 bytes
SHA-256: 45977d5af8b31073b33bb92f8729bdaff44601e8676e5286354f6e206ed6e6a9

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