Malicious PDF — malware analysis report

Static analysis result for SHA-256 329ada2b1b9c51bc…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 21:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd105e16e83e0218ad11424650987af4 SHA-1: 716ee858d2253fb38245cf01c80d3947d8a58898 SHA-256: 329ada2b1b9c51bc5ab48395a3c4e00e64e3b69b19990ed443576615e54d80ae
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the overall structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=toolkit+2017+apk+download PDF link annotation
    • http://prota.ru/upload/files/wukoritod.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/70701188280.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/22106267159.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae59497a4---88913374486.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/dixopabapigovef.pdfIn PDF document text
    • http://vucert.vn/uploads/files/furawubureresivuw.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/54238959643.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/81663186001.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lqr14usv6qhkoc54mkrp5dqc3o/31513236780.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/85943655835.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/sobole.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210911160922.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tokefinekelugobi.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/40018289398.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/ravopuzezigejet.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/16695671670.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210912092334_wtjz42.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210903020602.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/68297339121.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/75016159823.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/43209300798.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/58862047709.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_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 10468 bytes
SHA-256: 3fa034515ba8bbd17fa0638e8f67fe5f91105cd783ffa5cb8397c472209e313a
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 18472 bytes
SHA-256: 19190d54581ea60b785c32b1b62a4c65f55db63c797cc9e2a4d88e6116510ce2
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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