Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcea3c6623b03278…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 18:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3f403c7ba6562da00d8738da8464c47 SHA-1: 4e81cad73a5cb23c78be5879ca67e47534bde23b SHA-256: fcea3c6623b032789a5136081a9bed345beb8a470570b1cd48432055338fbcc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on various domains, suggests a phishing or credential harvesting attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating a link farm designed for SEO manipulation, likely to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3cdc8e749---28100765313.pdf
    • http://rockpapersun.com/upload_mce_image/file/nololigudini.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/bb626ec990d4d17ebee50789fbdd11b0/30663381101.pdf
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/baxedivewujor.pdf
    • https://searchkar.com/ci/userfiles/files/69783034834.pdf
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5514283636.pdf
    • https://centaur.vri.cz/docs/files/virefutupidirugid.pdf
    • http://luisacortesearchitetto.it/userfiles/files/dugusivaxiliji.pdf
    • http://bridgeonlaw.com/filespath/files/20210908123715.pdf
    • http://jncs.kr/page_data/file/20210905080059.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/ripozokolisumasupukidi.pdf
    • http://energo-winstal.pl/userfiles/file/90119891023.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/fusegufakobopevowit.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/80932974797.pdf
    • http://vnationwide.com/userfiles/files/5093885385.pdf
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/lomorigivoximi.pdf
    • http://booklandbooks.com/userfiles/file/49580671026.pdf
    • http://studiopignotti.it/userfiles/files/35798857529.pdf
    • https://codefon.hu/js/ckfinder/userfiles/files/zesirif.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210915_220802.pdf
    • https://gotoko.com/cmsv2/upload/files/banenimasiponag.pdf
    • http://pyramidplaster.com/file_media/file_image/file/18397134767.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=danganronpa+trigger+happy+havoc+anniversary+edition+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b191.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 16792 bytes
font_01_sfnt_off0000c9a3.bin
03a83d6d924789b93fcfc0da545f005005104f47ac56f15297838618f4213296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 15712 bytes
font_02_sfnt_off0000f1a4.bin
e4d7dae60049f6263270936bde1f0a35cea755cb1bad1ba3980a19fbf49e5981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 11020 bytes

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