Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3799ec60882ffa2…

MALICIOUS

PDF

71.4 KB Created: 2021-03-18 05:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ee3db6f35b9ffce79ecc13c12293ef8d SHA-1: 8067a17f207a7822e54601d21f8987f1acbd7f5e SHA-256: f3799ec60882ffa2c18ad48ff021dfc648a115f21b0aba2c571887323a9240e2
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous links suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://dafemum.ru/award?keyword=temporal+bone+ct+anatomy+pdf In PDF document text
    • http://basijinogasa.22web.org/wordpress_download_monitor_multiple_files.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_603eeeb551662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_6048a33e545a6.pdfIn PDF document text
    • http://okclub.org/how_do_you_factory_reset_a_motorola_android_phone7432a.pdfIn PDF document text
    • https://pubategikosiw.weebly.com/uploads/1/3/4/1/134131453/8274154.pdfIn PDF document text
    • http://trychambre.xyz/juladamirisodih7fhf.pdfIn PDF document text
    • https://gijedilegin.weebly.com/uploads/1/3/1/3/131380969/4785631.pdfIn PDF document text
    • http://yoga-fitness.space/whirlpool_bottom_freezer_ice_maker_problems10lyj.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/3d78aca2a93.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/75179650017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5fc8a979ac1cf.pdfIn PDF document text
    • http://sberbank.link/toshiba_tv_screen_is_black2ptr0.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/cf81e15a-9805-4af5-b143-60eca06c5631/tugavupo.pdfIn PDF document text
    • http://nonibil.epizy.com/canon_in_d_violin_sheet_easy.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/parasitic_diseases_book.pdfIn PDF document text
    • http://wumevejuraluxe.rf.gd/vilumigomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd74a4f-e01c-44af-a9b1-3537ed6c393c/92511237968.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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 5316 bytes
SHA-256: 8674a828eef94039e708cbd7aea4a8ca6adcf0c24bec07cba76896f80e587757
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10364 bytes
SHA-256: 992b5356c3e9b85ee106bb900599dad3d9a7e316bfe93ae6b8ea0ea1730097ac

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