Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e38e045a9512cb6…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 03:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9de07807262a486e1d0b34b3a5f2369 SHA-1: d0363fd68704842100ad53d8cab1d9029dd2c322 SHA-256: 6e38e045a9512cb670b69bac92306ac282e289a9f7a086e3aa0ceb237d79805b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=android+app+player+for+pc PDF link annotation
    • http://jiangsutravel.kr/userfiles/files/20210924_054658.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/maxumurudepekez.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/22106372929.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_0657F2FBCC98C663.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/belafoguzebapeboxunebadi.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/gudurupupasagup.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/jevuvegarenebujir.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/xinuvarejedezopu.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/26250769760.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/44001955956.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/wogewetalitujoro.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/gugek.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/90760243496.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/rexatugalametalu.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/sojukofabunit.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/wilidopuwevipekigikezivax.pdfIn PDF document text
    • http://keramann.ru/uploads/files/82406019907.pdfIn PDF document text
    • https://yodobashi-church.com/pebitugesiwusotinipeboset.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kebirafifugafonosak.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/78985987443.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/10872574932.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/mitijimejojipolubukizulib.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_off0000afb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 10440 bytes
SHA-256: 5fe2bac513fbdcd4597359f1e7a06200863f1337dca1c0275fb82e3ec7212669
font_02_sfnt_off0000df91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF91 15376 bytes
SHA-256: 15d822d7ef0011cebd40a2c74732817703ce09fa9b2ddae544cbab2ab6516dec

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