Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bb77d691fc32fc…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 10:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 2c0fa994f30abeff25c4ee0b5107cb73 SHA-1: df8c11bbc05de2e0330cf44554a9c697d62e37fa SHA-256: 87bb77d691fc32fccd05e5e0d99228cfa0e113a0478bc93d73297a492d0c62b6
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 0.9951

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://crewmak.ru/uplcv?utm_term=aesthetic+copy+and+paste+emojis PDF link annotation
    • https://sergiomauri.com/images/file/88267537960.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/tiwonazekavopex.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3d3e3bf---79883104010.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/widanirefomag.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2bfa67b2---29893398875.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nujirisukeb.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/xulatatege.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xadetanixebunubuw.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/mubogeromovisiremenudewes.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/19758701408.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xujukatosul.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/74616171054.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/pevaluden.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/nonubup.pdfIn PDF document text
    • https://labelmarket.pl/data/file/87987185495.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/gepeja.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/katadonunilez.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/99917551091.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/zepokopigesibojesog.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/18941397653.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210914_7F51346A9547F046.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/37326502819.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/46193854373.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/96524133309.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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 23576 bytes
SHA-256: dc543d69756467db0e39d01e028878a0f1b6da826d2e9c3563e18ed8abfab692
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 10856 bytes
SHA-256: a364c3ac1346106e8833758e3b3a75b31be47031da88b2fc8d03af318c8990b9

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