Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3022f875a573579…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 20:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7493c5cb4c49d638b64dfe297ed7a0f8 SHA-1: 2435f50001db6a670a45e5d1461a77fa626a2a05 SHA-256: a3022f875a573579ca6f995e8a0f05d497a1519087aca65ffc8b4ffc54460469
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme, where the document acts as a lure to download further payloads. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=game+of+thrones+android+game+download PDF link annotation
    • http://www.euro-fly.eu/userfiles/files/xemizujuxenutox.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/3917899874.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pubejusibidekejetivawam.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/tulanuwelubazovave.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e24322b0f---lumapesasidokuxu.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/21937011665.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zumafifelete.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/jeguwovonumasuji.pdfIn PDF document text
    • http://qdjshg.com/files/file/lagibavis.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132649fc508e---finominuvaratutefose.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/40912007186.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/paxasufufixiboxosonuki.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/98524695140.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/41800566294.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/gufef.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/dexekuv.pdfIn PDF document text
    • http://naviway.su/upload/files/mapodanafetujozowazut.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/kedopugonoduvanaxax.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/60438940489.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/10472707170.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/gotugatogibedobov.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/xunowaleladuj.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/wawezoxivov.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68686277494.pdfIn PDF document text
    • http://palami.by/images/file/41388423476.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/32163094188.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/wajoxonomazaberiguni.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_off0000b828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03A 15132 bytes
SHA-256: 5a4f45d41ea13f7b884a4c9df2f0e416aebf97c07df2ce8de0ef767aa74c7d24
font_02_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10928 bytes
SHA-256: e5cbcb55d3e886016fb9a3671bbdacba60529d917758174770db2a51fdc3580f