Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d82ea41c09da61d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 21:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f13a734b8ed01cb8b6a7cc487d392432 SHA-1: 4a80e4aad401579d94a67de068881ac68df8e4b9 SHA-256: 5d82ea41c09da61da08c32cf7b967b81f182fb39e2f0cd5314594d5baeaa36b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://jenan.com/ckfinder/userfiles/files/wurolujudonovu.pdf In PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/3633579438.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/31056579206.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/nowene.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/77806396585.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916133317870875.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/78572084997.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/62606807480.pdfIn PDF document text
    • https://laps.pl/userfiles/file/37558738542.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/lixubisafatebesurilufo.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/tiluzebi.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/92899750790.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/59097289215.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ac68d519---miforebazasujosu.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/81559307358.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/40084197296.pdfIn PDF document text
    • http://mobiliteit.nu/files/14819354256.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/6751003560.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/46019739548.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/betitapixanefediz.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8ec2482d9f690a2928477b004d6f8273/zexutibafagedapex.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091407490779.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210902122718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=find+my+redmi+devicePDF 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_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 10096 bytes
SHA-256: d6ba55e9fd01b338ef27ec31bd5b68464209fc742eec8e62d1060ab3032cab27
font_02_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 17844 bytes
SHA-256: b7418c57beae78140a2da8c94b94ccdf79f76a17f2248df8c70acf2d3ae27abc