Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b135d6dddb18b75…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 14:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 650a369d65e9c93be96e185af25d1d98 SHA-1: 782d1e3823e6b1368bf7c650faf4a5fd1d7e5197 SHA-256: 1b135d6dddb18b7566c22d794601a84cc1a531a68742441d1231cc061b4e110b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to unknown or potentially disposable domains, supports the attack pattern of directing users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://ledins.lv/cms/file/29080245072.pdf In PDF document text
    • http://pijntherapie.be/uploads/files/45212601370.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xejukokeferu.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210929103131.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/45011405521.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/nunumepipifegujizijidemi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/betimakuma.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/60227254625.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/76601603913.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/zageretil.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/nukejemuloben.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/dibifujulugabuzewe.pdfIn PDF document text
    • http://st03.it/userfiles/files/wudogirufipa.pdfIn PDF document text
    • https://proxus.nl/file/fuvatojaxajifumedaduloxak.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/sumodutewivupapirorinor.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fafbded3224ecb49da08803f416c3666/sezowuliwigitodeburusivo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/47176137242.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614af816016e0---94784682582.pdfIn PDF document text
    • http://only-svet.ru/upload/files/mudiragegudejabulumino.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/zuregawunuvefikobeni.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/16830468331.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/41258941342.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/49453417723.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/toripitedizesugepur.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/69559298426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+scan+qr+code+iphone+picturePDF 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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 15328 bytes
SHA-256: 85c92496d8679c5c13f5421af3356de9b57af4a5a227b43c76197b46ec30465b
font_01_sfnt_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 10888 bytes
SHA-256: f27f8eeb03d9242956a2d749ffaed9f8d6198742be65860052eb964e66c0de60
font_02_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1