Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e3affc3082a70b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 18:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2428c6c69ffd4128bf641c43bf69c441 SHA-1: b7574b1aab24e4ffbabbbda7a8c560ff70f92bf4 SHA-256: b2e3affc3082a70be078816a9e58b91e448c9c37c0e52bb13edb831a35d2a114
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drisraadentalcenter.com/userfiles/file/fibebumafiduzo.pdf In PDF document text
    • https://simpangkanan.com/contents/files/56793862033.pdfIn PDF document text
    • http://roocenter.ru/upload/file/42747794266.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161455f1738249---88333709650.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/fixowalapemapefowa.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/25763518688.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/24484311169.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/sagazumupafafeb.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/favufiderujumirenoru.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/vasofipaxapitisujode.pdfIn PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/zezuvumisaborew.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_89FA979AF91DD232.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tufajawidobogij.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/46738514505.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/46381577031.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/6260333801.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b3628a3bb815094bc0ba88417cdb1c48/wojinefinud.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/38557378407.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/69663311748.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pufasezexir.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/55454031548.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/rupaposeniv.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/28059182650.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906081310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=castle+crush+hack+mod+apk+download+unlimited+gemsPDF link annotation
    • 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_off0000babe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBABE 11268 bytes
SHA-256: e71f9a629702e4fed1cb35dbc6ac4c4ac06b21d8c07c99b6cae10999ee562255
font_01_sfnt_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 17004 bytes
SHA-256: 7796e4ddfe4a842b61503888ef1366ca9f51679ef58fa2ebb5ede1af5b5b5816
font_02_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1