Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89fbfaafa4d5d69…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 09:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4748b65d6543f5eadfb1ec4c86c1a2b5 SHA-1: 84fbbed3951f3d160c6902c86caa353be098f14b SHA-256: f89fbfaafa4d5d69821ffd52b80100128c51b58571626f4f985b5763c788b979
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=change+m4a+to+mp4 PDF link annotation
    • http://paradisoseminatrici.it/userfiles/files/dorup.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/60093416875.pdfIn PDF document text
    • http://machulski.com/public/file/bejafojarulopasozo.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/98611514178.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130303319b1b---xenopogofozojaj.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/xiperumujaravukuxisokul.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/vupam.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/66521025443.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902172021.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/zimifug.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9dc8d21f7a207ea405f0d1569a066142/51650656080.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/23492498138.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/lunulut.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/23675219325.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/69542570813.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/7099925875.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/pinixipuxopudasetuliragoz.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/95022923041.pdfIn PDF document text
    • https://filetorme.com/upload/files/47235689379.pdfIn PDF document text
    • https://coevent.ru/upload/files/xatesepazimonoka.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/vewasofoxetanaw.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/46121652480.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fasabezazagozovulebarolir.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/17807542652.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nobajikek.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_off0000e56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 17996 bytes
SHA-256: 924619eb79f6ba17f06466fbc81336e5d06a9147955d57ad8f37db81607a9cbd
font_01_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 10400 bytes
SHA-256: 9890c70de9ba578b151af03383b74ea34110bd3173a9303a4148e3cfbe587a68

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