Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b143027f4128b3…

MALICIOUS

PDF

75.5 KB Created: 2021-10-07 18:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7a4d5fb975131468e3805d455a2c8688 SHA-1: f038ee1695509583b7aadb7d024bab78ed738b84 SHA-256: 39b143027f4128b395314fd9218ec0ef3202a21259465e9f2104462ae04cf766
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kasand.com/userfiles/tuzivujorigekaxepinizu.pdf In PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/35300815959.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lowejuwikoli.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/33295249159.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/615c48a62bb67.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/nugumadusuxibedafu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/45907982184.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/jusofafob.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/46238182730.pdfIn PDF document text
    • http://birdwatching.sk/media/file/kapelade.pdfIn PDF document text
    • http://xn--90aatbabxd8ae1kf.xn--p1ai/files/95898604386.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20211007_EB1FD5E824AB17B7.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/39824758486.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615088ba3b687---solunilikisabinivo.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/73846523918.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/96714039629.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/50449697514.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/nabumesisenalotarevu.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/21085697035.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/85403958758.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/98933321896.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/40010121480.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615952f9ae837---15687725275.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210917_111605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=praying+for+our+nation+and+leadersPDF 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_off0000c1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D7 18044 bytes
SHA-256: b2c46f758667e7040af3850172812d0646d2b655371610c723d0039f2a36774c
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 10744 bytes
SHA-256: e9b984a72cd9c0f4ae5c6b456f39f83107cda7dfc55191d37ad0feefd82086cd
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1