Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcaf0a527319e62…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 23:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58f2b62a2bb40a41cf570276f9b56e9d SHA-1: 15c848568cb79c7e89c74e069f70b1990fb31319 SHA-256: abcaf0a527319e627dd18eda25a35b1c917ca0a37074a7992b8488ebf396f00e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO-based distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://grandfiltr.com/files/file/11775648630.pdf In PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/26265634134.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/19032040900.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/31548586426.pdfIn PDF document text
    • http://cga82.com/admin/File/23460739991.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/80388064300.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/53365021066.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/metafagifajoravukexus.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/41222865792.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158b313cd3f9---wivuwot.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/33916230493.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/kuwujujowakividorufane.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139c57e92850---tosubiforam.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/16503803367.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/14254282417.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/61065051016.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/dadilapanadirutejovunedij.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/nunelutuxula.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/dodemovedarogodazipu.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/kifako.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202110011123358234.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/sepuvijafubupexajisux.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/70152491176.pdfIn PDF document text
    • http://strandedtattoo.com/file/sarozuwuraso.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/pivolunori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=navy+tugboat+for+salePDF 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_off0000b36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36B 15896 bytes
SHA-256: a00a844a237149f1ea3c8ab12e6a4a4f41c7d63b1007434447e69bcf9cebe533
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 10592 bytes
SHA-256: a5af6b07e818e4c70863db6d6aae898953137ecf0b01b561ccb44c8f04643da7
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1