Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2a9e063639ae4c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 13:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ed22c06c11413639e127e5ddda6e1382 SHA-1: 2d3d66e89ebbbdc53159e80d4c02c258a21cc2b7 SHA-256: bf2a9e063639ae4cc56ee4ef791215c7fac0748cf34494d42b5a96c28e1e719b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest it's intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=how+to+secure+your+android+phone PDF link annotation
    • http://marleenjansen.nl/images/uploadfiles/rubut.pdfIn PDF document text
    • http://exima.kr/userData/board/file/mapefekigovegekuvov.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/xiviz.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/revebopekitafodarud.pdfIn PDF document text
    • https://network-italia.it/file/woladogoxa.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/muveredigemevu.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/14642750574.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/4116852384.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tiwozomevogezibevamenijox.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/43036169767.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/46477326533.pdfIn PDF document text
    • http://jor-agric-aqua.com/user_img/files/52798041078.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tesegaxuxevikepelag.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/nubuxurolaraxixulosugodor.pdfIn PDF document text
    • http://wwsm-us.com/files/file/fixadidisavinulibijel.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9c9f114da---30417377385.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/86540237477.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b2f0137d3c023c50b036fa9bf88a6721/19495434571.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210926173626.pdfIn PDF document text
    • https://afma.pt/site/upload/file/91182831005.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_off0000ace7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F9 17736 bytes
SHA-256: 1f85cad54b387eedc9f34924626bcaf1500ecd1946c3fa0ac4b009d4cff4d309
font_02_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10856 bytes
SHA-256: d8006bf3d0b83fb24371ca7c7236c17f801f91b5c0e3d5c4fd129559bfb5c8d9

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