Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c47a5bd4ab7dc1…

MALICIOUS

PDF

69.0 KB Created: 2021-02-04 22:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f4b71fbf07b38e814e18a7d167e9abfd SHA-1: 78a41d691317898d44c622a480578bdb0aa73d71 SHA-256: 65c47a5bd4ab7dc1636292b795dd3fdebefa47454c640082062588e1f9d39b3f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=house+number+plate+ideas In PDF document text
    • https://static.s123-cdn-static.com/uploads/4427274/normal_5fc7a30467657.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/higrgfE/flip_flops_bar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5febcd03cd9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_601976bd25592.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/hhpjjLd/zadorekiverojidiw.pdfIn PDF document text
    • http://zugipipekuf.22web.org/guvagog.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/JjgYjga/little_lump_in_ball_bag.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/gchidia/recharge_netflix_using_phonepe.pdfIn PDF document text
    • http://zozuwax.66ghz.com/gufisaladivejefafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_600044cecd7ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_5fe06d45c7958.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosareregaka.epizy.com/42271967812.pdfIn PDF document text
    • http://dufogatate.epizy.com/aggiornamento_android_pie_huawei_mate_20_lite.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/equation_sheet_for_physics_gcse_aqa.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/65633536007.pdfIn PDF document text
    • http://devisufuxuvit.epizy.com/campbellsville_university_cpt_application_form.pdfIn PDF document text
    • http://lekekavom.epizy.com/bulma_css_framework_templates.pdfIn PDF document text
    • http://bezegorev.epizy.com/tamilrockers_attu_tamil_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/balance_druid_pvp_guide_8._0._1.pdfIn PDF document text
    • http://pukadevimetuz.rf.gd/ccs_ba_date_sheet_2019.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_off0000d292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 5208 bytes
SHA-256: 732332186704ab30595a0ddf7c7d39243469093f19158af66a0344fc536e6bf3
font_01_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 10172 bytes
SHA-256: 2fef7fda8cefb48d38dc1fdfcde428942f4a7aa27a7d3c0054e0b24ebb0fc040

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