Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40f44b324554968…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 15:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e699ca63030ac14a067788846e1d7688 SHA-1: f984b79f9789fa72fe34a6dd9173883ab6667370 SHA-256: f40f44b324554968baea9985972ee8dddad22d427b61319853c6b83b0e719c6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=giochi+gratis+per+android+in+italiano PDF link annotation
    • http://rogatka.osieczna.eu/userfiles/file/32027322770.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-27/20210927010633869375.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/wesizavagomuz.pdfIn PDF document text
    • https://frisch.ro/files/file/toxeniwuve.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/35649454763.pdfIn PDF document text
    • http://texmet.pl/userimages/file/88990976186.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/34268760044.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/33744501107.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/208101512.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/bigedagagerege.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/bilekajubuzunarorotofu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c115756f1---55734638907.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/738598582.pdfIn PDF document text
    • https://red-adlay.com/upload/files/rofelagenadudodinebutub.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/vixedefigosofojud.pdfIn PDF document text
    • https://themalc.org/files/file/xorapejejulugagadoda.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/24520261651.pdfIn PDF document text
    • https://peterdegendt.be/file/52685737424.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/nomorapiguxiki.pdfIn PDF document text
    • http://protezas.lt/i/File/3787868015.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/72298485090.pdfIn PDF document text
    • http://paradoxine.com/upload/files/bemofotonusefotujibo.pdfIn PDF document text
    • https://ikansambel.com/contents/files/73034481712.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_off0000b13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13F 10832 bytes
SHA-256: 558528cb63895f31f3493fd8ae3fbe99b339d42529d16d18f691f259a3b83d95
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 16456 bytes
SHA-256: f472524245681a22a819fd8babd0f73e974e7e8da52d4526a1efb11995442b7b
font_02_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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