Malicious PDF — malware analysis report

Static analysis result for SHA-256 103499952091ccd6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 04:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1acec0b0928672ed7017d4711f03628 SHA-1: 0966718648c43abb5c47d78c22d771aa23132f78 SHA-256: 103499952091ccd64351b2348d8b624190babcfaa5b070759a6d2847c9f6ffb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that act as a link farm, redirecting users to various external PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to lead the user to a malicious resource, potentially exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cructi.ru/uplcv?utm_term=hanuman+chalisa+written+pdf+download PDF link annotation
    • http://vititanon.com/user_img/files/juliwi.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/zukabelodujuvasudobox.pdfIn PDF document text
    • http://keramann.ru/uploads/files/bekafadatakenovuxow.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/vaviwux.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/denufiduzusob.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/nosobemumutupojutupol.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5ar34oc0l522rkm7iu9ppop89k/dojazexodefejatuj.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/73659382364.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wapegemekitol.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/kuzitabijorokajososaxox.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/zawesilobizomafugegotoxi.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/nexexojolesanotixaruro.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/20961631436.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/sivafom.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/digisaregusetukokajo.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/51853719018.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/49767537133.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/gunonivamunilenugosexesar.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/nekalabaxorotavovivepexal.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/dedujunuximimowap.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/77507798504.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210904_41D63D2C4904E582.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/t0o54dvotjrusitt79ue976gd0/getodoz.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://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_off0000b2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 16748 bytes
SHA-256: 8e18d2d70f28b669c42c4c67ef6471b07e4a4078c1b52c71c6ae946de1c26f52
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 11064 bytes
SHA-256: e8ab4ad77538a7fb28d49df2cd2781f37da4ecf7b298b9e8193a030b1e5bfc7d
font_02_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1