Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdfcf90ca221311…

MALICIOUS

PDF

69.2 KB Created: 2021-09-23 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 80d7050ca3f4fe5d8792e5d79089c15e SHA-1: 000ba65e8729a99f23b9875d72c1ae50d7d774e9 SHA-256: 9bdfcf90ca221311bf07f1ad763926da96c55477627bff8c4091aefd6911f9f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dgone.kr/userfiles/file/20210914133047.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/mumafejalogi.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/39904973739.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210907170102.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/fawegekigoguxenexama.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/95167035000.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/midurazotaboberewa.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/gekapokepogu.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/fuwexuxenikasoxamexekuvi.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210907_6D0618F2E52F7767.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zerumukawa.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/gawuvarerikinito.pdfIn PDF document text
    • https://athenaeumchessclub.com/ckfinder/userfiles/files/xowojozidamesaje.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139a54b21269---dodaki.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/55785437627.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137660bc9b0f---sezipateromomuwa.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/nusuribapez.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/norizetukoroja.pdfIn PDF document text
    • https://themalc.org/files/file/9877582953.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/65899670998.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/40386708086.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/39565861191.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/tiremotu.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/tukuzexisenesezaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=audio+to+video+converter+for+androidPDF link annotation
    • 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_off0000b0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C6 15244 bytes
SHA-256: 0a1adbc1d77b74c5d4d5ccb1f01c3854e373514f3e30578a74c10ad7833a349e
font_01_sfnt_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 10400 bytes
SHA-256: 8410aac886990d9351a8f98809cfd5d3c42673f5a1bbb594c09d9e9bdc19760d
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1