Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8c14febd1d914f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 06:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 46842cc5a0ec658c651321073f7c06c3 SHA-1: 47feb840deb9cb6eab6c3ab29c598ae44f2ef876 SHA-256: fd8c14febd1d914f19d223f00ce169d739bff97af913c45d1532d284117c2b2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to obscure the final malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=how+to+add+exchange+calendar+to+google+calendar+android PDF link annotation
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/13271461644.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/16951942161.pdfIn PDF document text
    • https://patc.fr/imagesfile/rovuruveme.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/wojidipifokud.pdfIn PDF document text
    • http://marine-inox.com/i/File/63793024371.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/11474997601.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/debifomawujulexusawadobo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec5aef2ed---jakomujamega.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/molefupifiselinorixi.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/52961745303.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/nonimadet.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/21651636584.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/13465704362.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/derivamupuliraxexojo.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/74101272559.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/fogosotatimaxolewadi.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/wixurizuka.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/busuvitedulibomuxepukad.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/borixopuzutaruwezeni.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/99727379698.pdfIn PDF document text
    • https://haidangpc.com/contents/files/29294607567.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kamaxumidiga.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/92707364096.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a750ae9e19---89191600255.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_off0000d2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DB 10660 bytes
SHA-256: bf6607b58e38cd887ab8d91904ed5f0f9043d62ae7fa6d73e50446c25c86a530
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 16752 bytes
SHA-256: 3536c2fc15df1fe96e89cac148e29d29e90d734aa01e87d9c1bca0786950e688
font_02_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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