Malicious PDF — malware analysis report

Static analysis result for SHA-256 e415220c36faa695…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 22:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a93f1d25d7c6e69a679497dbd1fbc67 SHA-1: d70da78bc599d1292afe13f902ec1effb1ffab70 SHA-256: e415220c36faa69524306512e333bed350552940a503765722bc9ebd362ddd59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one with a 'utm_term' parameter suggesting a link farm, points towards a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://burlingame.com/wysiwygfiles/file/besevuxebotetisepagonogad.pdf In PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/57515144506.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/94676266597.pdfIn PDF document text
    • http://taigesw.com/upload/files/josofufanovejevunix.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/zuwexujudid.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/64607629244.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210919150015.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362a98d7a22---48675300593.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ff3a38f40f0dde30e9bc804399ed3b27/87390858932.pdfIn PDF document text
    • https://wmu24.ru/media/file/ketajonipo.pdfIn PDF document text
    • https://partetesal.ir/data/file/matafaxowijuxafozaj.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/bufutiradopidawen.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/73373375082.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/93267071324.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/19791540400.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/95106060308.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/kesuvilo.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/vogasolikifapububo.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/50857003037.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/bejolovexi.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/26603032612.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/77632141114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ready+to+fire+book+pdf+free+downloadPDF 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_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 16196 bytes
SHA-256: a4792e63e34e58b48e9960b71814d30b1073ab7cd5b7159925fadaef47da444a
font_01_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 10800 bytes
SHA-256: a6bfeff0767e381ed17c50453d400758f426a4bec017244833ef91edaef24869
font_02_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1