Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b72358cd252398…

MALICIOUS

PDF

89.2 KB Created: 2021-03-15 10:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7678c0cac6c70205ae7e7c09cd0ed86c SHA-1: b664c1f54cb6a43e8dbe0120cc0a65a80fb2e48c SHA-256: d6b72358cd252398befc387e1e4e5d76c8130e14fecab30a9aa62f8df42c6c2e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and a link farm points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://vilenefex.ru/strik?utm_term=what+is+the+value+of+gas+constant+r+in+joules PDF link annotation
    • https://cdn.sqhk.co/telivagawu/ibifMWp/harris_jayaraj_telugu_movie_songs.pdfIn PDF document text
    • http://metazoaapc.fun/felaluwirunixitilubbalrs.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/8BI8Jkt/wiwikojabavewosep.pdfIn PDF document text
    • http://vabetovopux.66ghz.com/battletech_beginner_box.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/uicAijg/61065593417.pdfIn PDF document text
    • http://reduslim-buy.site/21330540096on8gt.pdfIn PDF document text
    • https://cdn.sqhk.co/wenovasew/gjfgft3/play_rummikub_game_online_free.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/sanutelenupufebezanim5wgzw.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/gdihieF/strength_training_exercises_at_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_e6f5eaf477e64944a3772e7229ab45ea.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_33886625523b441f953605cfbe8f6528.pdf?index=trueIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_846ca20ae57c45dba62930c69a287e34.pdf?index=trueIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_ddca0f2540194becaf6f37873ef2f049.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_eb9c06c3247848509c1f3850e46152a0.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_d548a8cfddfa4520984b7118b7685cbb.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_0ac2ec3a7be74bff809970b8b4c6454b.pdf?index=trueIn PDF document text
    • http://jepevam.rf.gd/candy_crush_apk_mod_unlimited_lives.pdfIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_d766d0a251214ebf9e79e0712348783c.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 5172 bytes
SHA-256: e1de8511f430abbde7e559a1ca90f0ab5a28545d883126f05613212e0748e209
font_01_sfnt_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 11656 bytes
SHA-256: 0d3bf2170b0a11979bc6387ae576692730f1115feaf2f1f535502ffaaf3dd4f0
font_02_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 16360 bytes
SHA-256: f9db4c28f42067c5a280255ef5c709361164f277599fb2ca7da3c9a7d4e37b20
font_03_sfnt_off0001491f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f