Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06e1c0fd9092261…

MALICIOUS

PDF

83.0 KB Created: 2021-10-13 15:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c655967bb44818288076cb48df3e7158 SHA-1: f4a3b02e6990a7e0cb825da86e496b6066a36351 SHA-256: a06e1c0fd9092261c9273959ab0c5d04f7984e8d8bf29a0339a162590a6278e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=cold+cold+water PDF link annotation
    • https://ecodiagnost.com/ckfinder/userfiles/files/dafibewejak.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/nafuga.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/7980087473.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/gibimilokenefavorig.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/44084167725.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/45308752621.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210930_03785351F25708A3.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/xudufidigurefakenunut.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/pipodarijezubumawezegi.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/5056480530.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ac7e9756ec---46610077449.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/vadetabuvex.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/45295652586.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/87188379464.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109261530203596.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///puzodaxupifekolitenu.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/pekin.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/nawagad.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/20421818828.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/95564115814.pdfIn PDF document text
    • https://koratspring.com/upload/file/fozimipupodufugiziw.pdfIn PDF document text
    • https://transturist.transturist.com/ckeditor/ckfinder/files/files/ratetifelof.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/27828277906.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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 19180 bytes
SHA-256: 841a7eecd44787abf2e744b8bfb5d95cf7bded6aa9fa072cd2b4946c30827280
font_02_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 10116 bytes
SHA-256: c021c2be7b3decbd9a368e7068c81257222574a297b5256e781a4d20d0bf4ebf