Malicious PDF — malware analysis report

Static analysis result for SHA-256 436c61d4048299dc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 02:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c86eeef687d6d041e914f57c12c81cd SHA-1: c3c058d6442511b1eeda501f1cdd75ef153305a0 SHA-256: 436c61d4048299dce49d786976b24b48f53fd49d6d30e5e89888e5b211c16767
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM, indicating a link farm designed to redirect users. The presence of a 'download button' lure and a 'password-protected archive' lure, combined with ML and ClamAV detections, strongly suggests a malicious intent to trick users into downloading a payload. The document's structure and numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=garena+free+file
    • https://marblo.ph/app/webroot/img/files/mazabulinugejob.pdf
    • https://rimsball.com/ckfinder/userfiles/files/34135661159.pdf
    • http://lgassociates.in/uploads/77238593656.pdf
    • http://skrutit-probeg.ru/upload_picture/file/35508281430.pdf
    • http://scbczy.cn/up_files/file/20210914_042838.pdf
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/ximegov.pdf
    • http://vip-cond.ru/userfiles/file/tatomurabe.pdf
    • http://kwiatmetal.pl/userfiles/file/rubixezixo.pdf
    • http://jj-metals.com/userfiles/file/2021090417490273499.pdf
    • http://foto-recepty.sk/images/fotky/82967923800.pdf
    • http://baugeraeteverleih.de/benutzerdateien/wuvubed.pdf
    • http://beiwendq.com/data/attachment/file/86947332456.pdf
    • http://lexen.ca/userfiles/files/21543824290.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/98460175084.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/wejetezebosusopu.pdf
    • http://casier-a-bouteilles.fr/file/60176918309.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d7cd402350be9c131185ea1b3bbef1d4/zimujud.pdf
    • http://tehnicgaz.eu/files/file/26989038065.pdf
    • http://otestmanager.org/club/data/userfiles/file/20210914155443.pdf
    • http://m3hotels.com/userfiles/file/davoregewuzutolugij.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/muxufimoluragil.pdf
    • http://brunagabriele.it/userfiles/files/mumoxuta.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139793cb8b07---kuxiw.pdf
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/tifenigob.pdf
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/49114667266.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16792 bytes
font_01_sfnt_off0000f055.bin
313aeaf94b984c0fd1aecd12aa352b3f279d31e60ef3989d7f860dd4dc655632		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 9860 bytes
font_02_sfnt_off0001060a.bin
ff819a7b66c9f4be535f46a6a797a40c4f2a301ea63bbcf3bc3b5357613ca14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 17532 bytes

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