Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc5747430261f94…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 05:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c02b49961ac36bf3688222583eb247cd SHA-1: 6b57820f24a6265a6497aec3a96e475cc11556a8 SHA-256: 7bc5747430261f94bae68f4ffe1ed8bba7c6c6752dbb049f8898f80c73b19ef0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 likely part of a link farm designed to redirect users. The PDF structure and embedded content suggest an attempt to lure users to malicious sites, aligning with phishing attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mrtowing.ca/Lawyers/userfiles/file/40816026536.pdf In PDF document text
    • http://ebrinteractive.com/userfiles/file/zawofilubowonadu.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/bavuwufovegadasol.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/21936828985.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/joxufujetuzilegadejem.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kabuviz.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/95898115863.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/gasebel.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/80594306787.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/72813590339.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/86704533255.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sulowok.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210912070231_2w7c7e.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/mabulu.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/litavad.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/sewalamatifomugame.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/14731447835.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/wekol.pdfIn PDF document text
    • http://inphilong.com/upload/files/sutopavobugiwamazen.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/93433077640.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/nemababulamewakebuwunur.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/26278510775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=top+10+app+in+play+storePDF 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_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 10496 bytes
SHA-256: bf8a97c9e0fef23979ea5690a4e85d373f9fd73374c30d70ad04d6c1aa7e7696
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 18396 bytes
SHA-256: 2699f0b691d1ef5c2b05cea2e7d4ed1221f7b8adbed641528ae8b5e962748fa1
font_02_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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