Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9daa8926d8b155…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 16:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c585a3565728a29302a8776c0118ca98 SHA-1: b73573796837e1b3666fe45c71b9dc54a1205816 SHA-256: df9daa8926d8b155270c126955164dc741fe71735ad30d4375893edd5672256c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a medium-severity rule indicating it's a link farm on disposable hosting, and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=euro+truck+simulator+unlimited+money PDF link annotation
    • http://finchamauto.com/pics/21054322448.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/pujebarifuvosujugus.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tufotirakududibafekiwiw.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/wepudanakotumilaxen.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/24705910645.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/rabibufesozupajosuxok.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/wisasakebaforilapadew.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/59581706515.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/19004996836.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/gawakik.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091412103315.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/xakatonovudilutuzemigojem.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/18016074932.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gifawunewilisaludo.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/82140052269.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ea3d52145cb6c4d1dea1d34dd2477e5f/66383148424.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kobuxikelunevisox.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/94419524306.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/fojivuxubepi.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/gapawosoroworojubusagexo.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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 17572 bytes
SHA-256: 806c85f1d0694fa5e33f3ecb5fce0dbce474646087aa49513eb8cff846457514
font_01_sfnt_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 10820 bytes
SHA-256: 82ded109120edce9805b6c64e561d9530044c2f6850144e46a359203ad529850

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