Malicious PDF — malware analysis report

Static analysis result for SHA-256 31763f0bf39ba13e…

MALICIOUS

PDF

71.4 KB Created: 2021-03-20 02:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d375c5c5217adf2c6d8771a0068dce17 SHA-1: 43f20a6123038f3128f47cf4c71c7e266f662f35 SHA-256: 31763f0bf39ba13ed067e16c4c6abe19945912d912575803f04dd37d5f0de1d9
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery. No scripts were extracted, but the overall structure and URL analysis point to a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://dugedepap.ru/strik?utm_term=how+to+change+the+battery+on+my+dyson+v7 PDF link annotation
    • http://filfex.ru/costanzo_physiologysa869.pdfIn PDF document text
    • http://sberbank.link/kurevuk2mytt.pdfIn PDF document text
    • http://jsexj.fun/garmin_oregon_650_vs_650tgcp25.pdfIn PDF document text
    • http://waystep.site/74285628122s9w2p.pdfIn PDF document text
    • http://acgmgroup.ru/wordpress_themes_free_download_responsive_with_slider_ecommercexttpk.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/rdr2_side_quests_chapter_6ok63q.pdfIn PDF document text
    • http://fukatamuvubigo.iblogger.org/alita_battle_angel_telugu_dubbed_movie_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidafusotiba.epizy.com/90718193998.pdfIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_b1a6baa1d0094b3697cec82c6f6dd4f2.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_eff6717ed8e74747a02e9b6425d0a23d.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_91924fa714b34a2eb7f459d4968d4e22.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_026ac83be27e4b0ca94d1c2cbb259ad4.pdf?index=trueIn PDF document text
    • http://lawodedizijipem.epizy.com/milelepedifelikatax.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/13070148614.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/45173122395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db29ddcd-6a5e-4bba-9efc-56bb10a3c8ac/74510431584.pdfIn PDF document text
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_25b2f33b2ab54d3c9bf92575f1b82b86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48d9ab7-bd8a-4790-9bce-1e2315f993d6/wuxaketa.pdfIn PDF document text
    • http://govujetimavex.epizy.com/danilirekikapikodibolupog.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 5756 bytes
SHA-256: dea9586a13fac509543f4f60e0e4a4c6cc9ab0793f9b509e13a8f6c0d99f9112
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10476 bytes
SHA-256: 952f9b9b0bd887a05196fcfa4386c84da152b95f774d44fe0d2eedbeeebe7b2b

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