Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72fef102d2bd993…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 10:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9eb0b079b5ca5920742891a8e29e70bd SHA-1: cb5d31d14ad3c54d04f2e0e404322762a9bc6b49 SHA-256: e72fef102d2bd99362a07061c9f1d42d101aac953c09f721ffe1c34f316a0e6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to domains that are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=view+source+code+of+apk PDF link annotation
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/fadarif.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/viwagopuneporadazizuwovel.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/3625679701.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/najesadojemolaxovasusono.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/90229800413.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/37722056920.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/kemiduxamapawonakix.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/83730265567.pdfIn PDF document text
    • http://ping-property.com/user_img/files/gijisarofabogigivuw.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/tomibosawaveg.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/71000711609.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/57971999997.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/megezodewenubiju.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109051021389508.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/8994523120.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/99954849181.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/jipezigekagi.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/wadewagag.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161355d5885d61---fabemisifubag.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cs2ul7jl9hect6ta4kd78clj06/guroki.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/54723157679.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210903040501.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/24845448493.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/sigefon.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/63332049326.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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 10612 bytes
SHA-256: 3b6ec892fbb263ca5fc11493a95bebc35cbcdb239172f8e6160fa66794f9de0a
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 16216 bytes
SHA-256: 742a6f8df971d8929ee21cfa3e39cd20c39322b1e593b7fcf8dc5b38e4d67359
font_02_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1