Malicious PDF — malware analysis report

Static analysis result for SHA-256 260150ceeb1038a2…

MALICIOUS

PDF

68.3 KB Created: 2021-06-11 11:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1dbb7caae3ab2d7d3af0cc5094ec6fd6 SHA-1: 5355119c2a75b3fbdc176a61ccf4938e7514dbe9 SHA-256: 260150ceeb1038a26f85de98b5a6b6bbd39410de25ceb3467a2d868ae388657d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing infrastructure. The presence of embedded URLs and the PDF structure indicate an attempt to redirect the user to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/pbw?utm_term=the+enjoyment+of+music+thirteenth+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4503578/normal_600403813ba50.pdfIn PDF document text
    • https://detiloxobaz.weebly.com/uploads/1/3/1/3/131398171/ruvune-lajukawozezig-texolobis-kazerike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5ff1934a6da62.pdfIn PDF document text
    • https://lomasegikuporot.weebly.com/uploads/1/3/4/8/134846826/1762423.pdfIn PDF document text
    • https://kerusovaxi.weebly.com/uploads/1/3/5/9/135978613/galerija_vutimaxewup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_6069c2f25bf04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455645/normal_604f63e2119a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fc98dda0b074.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/wojezegezizufiroto.pdfIn PDF document text
    • https://wobafedufuj.weebly.com/uploads/1/3/4/0/134012960/f2d36c98.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4369912/normal_60b7339c56e06.pdfIn PDF document text
    • https://zilifanaj.weebly.com/uploads/1/3/4/4/134444715/09deb8f21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_6061fc6428e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492573/normal_5fd7cee2c6120.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/xinagoja_norowejo_vujinekem_wuwosuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_60656210f2317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff1ca0e-d926-4904-a50d-ea8302ae7794/fofexev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd286ad-fb73-4a98-ac8d-098d89928a63/the_power_of_one_book_plot_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba62435-89c0-4636-9e0d-5ad2e9116e47/wixigegigepubep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bca8fcb-cbc0-48ed-9dc4-6f17f6f48238/finizoxavowuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891ab83f-f349-404b-adb6-8347f70d59a8/how_do_you_know_if_a_guy_is_genuinely_interested.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF82 5280 bytes
SHA-256: 820083c0df44e94eba4807d645d3b86c562e455fe1e0df3c53a3a80260b65124
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 10024 bytes
SHA-256: dac52bfe877a30bcafe182a0093153390217be51f54ed76f579d9e9a38705fb9

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