Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca28d6648d6c3670…

MALICIOUS

PDF

101.0 KB Created: 2021-06-01 04:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c6b06bfb435e4a70e7f1c7299571a3ee SHA-1: 6e29644b23b3fbc278014581b262614104c7ec8a SHA-256: ca28d6648d6c36703ccc84253345579618382a3a786f4f7a2b77d863a7787215
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently featuring a search term for popular media, likely as a lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for numerous links, suggesting a phishing or malicious content distribution scheme. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://catamma.ru/pbw?utm_term=naruto+shippuden+episode+119+crunchyroll PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486199/normal_5fe90ac371a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478383/normal_603c2fe9c1358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_60023d18625fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_6008c2b687629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5fd16f8e8f0f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_60244abe8f672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486765/normal_604f9dc62a249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409425/normal_5ff780161a9c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_60036343e17c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_600f00ca284a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144432582/how_does_a_fire_tv_stick_work.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/73299471450.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144433059/18354650959.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/49758556203.pdfIn PDF document text
    • http://didaneguk.pbworks.com/f/book_of_baruch_chapter_1.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/kojelugetafaw.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/f/what_does_the_triangle_symbol_mean_on_dashboard.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/where_do_i_find_my_w2_in_adp.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/takopemu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 25308 bytes
SHA-256: 25f3867441ba64023a3ee464439a0fa45af4d0cf2fff2da8a2bc89241e07110f
font_01_sfnt_off00014965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 5440 bytes
SHA-256: 1a28f49678caf3b1ef86819f34e16afda3328ecdc807e5cd41ffe39e9734d05d
font_02_sfnt_off00015bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF1 13012 bytes
SHA-256: 3fdfa62400f0645c3b33b20529975571a624c4ae0226f1e380e4bd5dbb46cbca

Open this report in the interactive analyzer, or submit your own file for analysis.