Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ba89e964473955…

MALICIOUS

PDF

76.2 KB Created: 2021-04-08 07:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 808eb7806bf31a3e849836d0eb80aaca SHA-1: 4592ba2dd6bf0dae62320821d631f087986a1a2e SHA-256: f5ba89e964473955f49e3fde2f0a0551835f46cbafbaf5b0f0596c96164dcfc6
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=uktvnow+apk+mod In PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/8894414.pdfIn PDF document text
    • https://favipipuwebex.weebly.com/uploads/1/3/5/3/135397367/samemovaxa.pdfIn PDF document text
    • http://usacreditreport.info/642334194987upra.pdfIn PDF document text
    • http://natlegend.space/basketball_president_manager_proz1r32.pdfIn PDF document text
    • http://keysecret.ru/business_letter_format_example_templateoexav.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/business_intelligence_analyst_resume.pdfIn PDF document text
    • http://dommasters.site/dsl-2730u_software_update7duyv.pdfIn PDF document text
    • http://bluetea.space/knockout_js_pass_data_to_template8uhzj.pdfIn PDF document text
    • http://snegny.com/how_do_i_setup_my_dlink_router_as_a_repeater_dir_615reyz2.pdfIn PDF document text
    • http://italiahot.space/are_soft_shell_tacos_healthyboh28.pdfIn PDF document text
    • https://sozawozoxo.weebly.com/uploads/1/3/4/5/134509422/dadatopametomabufuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowilewegiwo.myartsonline.com/nature_and_functions_of_law.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_9698a059e96542af9b50c3edabd11fe3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ritoma/47064835003.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/17695751938.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_0441f8f68dfa4c75a94dfe2a2326f628.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_68b9161b91464e6cb8dbe47d30e6d276.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewibim/87754125259.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/fasosepomox.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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 5004 bytes
SHA-256: 2f4ca855770b80b9ee52a73812c5bc7586593d9f68b6e9c4778f037a23c91d41
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 11196 bytes
SHA-256: 4f1c5b3006777e131467b75dc2244704fb26f9932317672c4eaadad6fc7b38f9

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