Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c24a4e3f266f54…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 02:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: f91799b874548498e497728fd51bc643 SHA-1: a21c6d9d966a7575c57b35d681034fdcf20cc868 SHA-256: 57c24a4e3f266f545c474a543308b337d36ac6d058b4a6d48cccb9b5c443196e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sukaunited4d.vip/contents/files/21905844003.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/sakudupaximamevivabu.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/gavonipamodekelixitite.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/62249839243.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/59509109717.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/28075133356.pdfIn PDF document text
    • https://fong-cai.com/upload/files/lopoguranapep.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630863443_8b4ce85c7b.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/23356320545.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/lokupenebebe.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/22403713476.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/fesetovibomalufomidares.pdfIn PDF document text
    • http://www.bandungmesin.com/file/wekigezubetowofik.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/gazalonezarabuxawopuge.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/11312797200.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/28193618984.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://orrizon.ru/images/file/11639528838.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/nogiluluxilimabenida.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/27797571839.pdfIn PDF document text
    • http://laduses.nl/image/file/vanuxesoz.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/dajakaxinumepukizib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=instalar+android+en+nokia+n9PDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/78706643916.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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 10452 bytes
SHA-256: 56d5189bd8f205f1488c9e9f1a8a63e1ec31c4964c80651fabeabdf305e69bb2
font_02_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 19892 bytes
SHA-256: 841a5e0088341dd4e0e050a6e7e9a28ad3ea8771421791573953cc27940d1159

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