Malicious PDF — malware analysis report

Static analysis result for SHA-256 11342055be161adc…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 19:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1862fb25bd7d416ac5e5cce93403c1ea SHA-1: d36da6a8d50d769f005dd5128aa6a3aef0c1aa34 SHA-256: 11342055be161adc06c2c13506de77cacc753ef02fc524fe51525e44e20c9665
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, suggesting these links are used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=voice+reminders+on+android PDF link annotation
    • https://muzeumkonstancina.pl/attachments/file/86873009081.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/1224048753.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/gufolizijasorufas.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/58137805598.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee6e0b32f---28682199645.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613142772d96f---mosewumesoxe.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/93461203661.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/desejo.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/7037220796.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/muxowexoxare.pdfIn PDF document text
    • http://haai.org/upload/file/47051601749.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/zuxumozatovuguxibanozo.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/kawikape.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/85998370235.pdfIn PDF document text
    • https://rafautama.com/uploads/file/zonenejojiw.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/51807318343.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/dofifeg.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/77143628565.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/85072418426.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906042027905.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/devad.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/xiputeno.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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 17536 bytes
SHA-256: c58019e329896f4a8b3984ff11eaf073cc8dc31e0a0dedfc604e1c58a1a465c0
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 10356 bytes
SHA-256: 0910fa42b5a70bed035ea424dbdf703f9467c600aa7d83cc99f3d3c19f65fd6a

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