Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c2dacb4b70257a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 16:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bcb81feb433a359a761a5ee008e7ce6 SHA-1: 1db4c4b4ff8a151082f2c0e9d8b5aa936a8fb3ff SHA-256: 66c2dacb4b70257a84c3af5b450dd2b900a74f1edeab57b99c3370f20b6b0a3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a tactic to obscure malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=remedial+mathematics+book+pdf+free+download PDF link annotation
    • https://penzionradvanice.cz/res/file/1860884392.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202108230309274612.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/nagogijapoxa.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/dutejogigowewikiwokitojoj.pdfIn PDF document text
    • http://hasyo.net/files/file/femakedexivodewaxusejex.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d36e8e0a994---vopadobexesufaditeguwe.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/savifoziw.pdfIn PDF document text
    • http://benrassam.com/uploads/files/dafeta.pdfIn PDF document text
    • http://wjcopy.com/upload/files/45885801033.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/71184409.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788d0fb03a1---palaxodizos.pdfIn PDF document text
    • https://kapokcmassage.com/uploads//files/202108100034535236.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/8908180989.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zeranupamolajugori.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xalabumekuvufonusovurig.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fuxazijasobewo.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/suwukuferuxi.pdfIn PDF document text
    • https://la-klamm.org/Files/files/76662454567.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/94639994057.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/86041340195.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/4883263662.pdfIn PDF document text
    • http://hodori247.com/uploads/files/fezagatasuwobitujiluza.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/gesekusuxowate.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 11248 bytes
SHA-256: d9fa20a57b6d286ff347b6d46ab3290ff9d1202a03ea423aafcf661e90bf1356
font_01_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 17784 bytes
SHA-256: 3d4701f9e261657f1d30a525bef52ca3874cb8b117eebea9e5b2e5c2c18c3c62

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