Malicious PDF — malware analysis report

Static analysis result for SHA-256 036b2875bc3d04eb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 14:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 836b329b6c3f05f404cb687baa8b0c01 SHA-1: b4e6f112fdece506d156dba10af9f7831180c6e8 SHA-256: 036b2875bc3d04eb33fbc86bb7e8711dacaabbe3bf0fc484295a20f0c8fe69f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the PDF and its embedded links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://aeusjtu.pretty-match.com/upload/files/ketaradabitawu.pdf In PDF document text
    • https://bursakaynak.com/userfiles/file/tabanivupegagiwo.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/82478883103.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/furofisagixegidimofogubot.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/rusemagigasuvametivez.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/8783780398.pdfIn PDF document text
    • https://diphong.com/uploads/19534436828.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/83205554726.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/64213284314.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/7391617353.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/96995968731.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/57e68temov8d8fjqrj4gupgbj4/kuzomifik.pdfIn PDF document text
    • http://chemsdano.com/upload/files/dexavedezed.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/runilanomarolubamaferi.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/kesajuwedubexavoz.pdfIn PDF document text
    • http://goref.ru/files/file/simuguk.pdfIn PDF document text
    • http://proart.by/media/file/53935362772.pdfIn PDF document text
    • http://irinabailey.com/upload/files/nufilabiduji.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/38875759105.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/zomumeguxudufazafarosolep.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/bojomejamojafusi.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/66779607063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=latest+android+version+for+lg+g2PDF link annotation
    • 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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 18652 bytes
SHA-256: c3e647a0cc3f298e0ec66a62b816a18f67f9e278dac20e5063facf383cbeca3a
font_01_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EC 10672 bytes
SHA-256: 3cb3ef4c82a171b72b95e41666912c8d5e9035b0887907b535f805a6e01e1eab