Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe8eb1831515495…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 17:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2f48615181cbdae68ee286b26ea1835 SHA-1: 0cd17c480b23442f7d80eb9442cbdadf6787ac41 SHA-256: 5fe8eb1831515495ad38cf186b898b5947b2b4dee3985c36b0dc062a8696f8b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

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://queure.ru/uplcv?utm_term=cell+phone+reviews+2020+canada PDF link annotation
    • http://exima.kr/userData/board/file/85466850131.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/semowekobelonubekopel.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/85173421815.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/jisuku.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/16231014253.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613433b35dcd8---rodiwaxebazegide.pdfIn PDF document text
    • https://tmtteks.com/files/81319652319.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xokiwakajeveziwebes.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/76043930238.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/rujijizituzufagemevunuz.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/tifiwi.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/pejazedunepurorefo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbaec10d34---99022629526.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/79712899688.pdfIn PDF document text
    • http://dsfly.com/uploads/files/gezogofazujogutinadub.pdfIn PDF document text
    • http://dominant.name/userfiles/file/8559546810.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/70664181332.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/xotajuxe.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/befonalukoxarobe.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/fezozerazi.pdfIn PDF document text
    • http://ladna.pl/user_images/file/87718717196.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/92473556711.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/bepopomeniguvoruxotodot.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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 10936 bytes
SHA-256: d1636e495903369960ab2a03fc63d6cdfef45ec1da1575cbdbd74021022f2b9e
font_01_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 17608 bytes
SHA-256: e5c5213fce1fb61c14b5043d966638f09e0a4271d6cc93382e1bf0c7245aaa2e
font_02_sfnt_off00012d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1