Malicious PDF — malware analysis report

Static analysis result for SHA-256 82be8c2566ee642b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 18:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df8d86e79f4c5b08ac93f230c0693fac SHA-1: 6a876695eed8ab5ead30cb268d2dcf9abfe82e92 SHA-256: 82be8c2566ee642b046c94f093cd3e195df97c0bb54f79853d38b369013b55dd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The presence of 'LOLBin token sequence in document text' suggests attempts to disguise malicious commands or URLs within the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://smidgel.ru/uplcv?utm_term=attack+on+titan+2d+apk PDF link annotation
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/sifajubefitavukokadetijo.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/6468194829.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/korupexuxejo.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/laxepalav.pdfIn PDF document text
    • http://beta-rc.com/upload/files/luvulirumulajexuj.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/43059246073.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/defowotewixovisumig.pdfIn PDF document text
    • http://midospa.com/upload/files/wanubiranojixobatu.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/40412519705.pdfIn PDF document text
    • http://firegallery.ru/img/upload/vumegikonugegaxi.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/74324391337.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/derumodakopidabonudix.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/doretuvugofosugifasap.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/wekikipilasogoguwiku.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/zogixokiwafotebujizid.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614623fa521de---katobuwudibibuni.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/jikit.pdfIn PDF document text
    • https://best-label.com/upload/files/98897944632.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/topapopak.pdfIn PDF document text
    • http://esangsok.com/upfile/files/nubejoraxewenikudobalubu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/63226293821.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/89376545501.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/penobiweguw.pdfIn macro / runtime command snippet
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4190aa51a26d70f2946a925dda66db28/lutexex.pdfIn PDF document text
    • http://jongauger.com/usIn macro / runtime command snippet
    • 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_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 10252 bytes
SHA-256: 94901becdb0c481dec6ae13eaa1f564c3d0d3a162fb7f30553579d20f875dfa9
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 17132 bytes
SHA-256: 0ac8faff2cb6b171424b573bc9c950cce1154cba88250a83872c076156505c8d
font_02_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1