Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11967f8c2cf66be…

MALICIOUS

PDF

134.6 KB Created: 2021-03-12 01:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1ff2d7eabd495c277400a61dac4a9cbc SHA-1: 3656a0df0978cb05b8889665b3379c739c18de4f SHA-256: b11967f8c2cf66beb7f4d352c04fdbab08d35c5eed87e3d8f5cb389f4bf16f69
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/award?keyword=reliability+theory+with+applications+to+preventive+maintenance+pdf In PDF document text
    • https://cdn.sqhk.co/nejibija/kieqejd/40443392386.pdfIn PDF document text
    • http://weinmvc.net/words_that_start_with_non_meaning_nottvu64.pdfIn PDF document text
    • http://leqqurint.online/698766848831z0xn.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/hhg2Ecs/brick_breaker_star_space_king_hile_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fcbc4022a7ea.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/lemony_snicket_a_series_of_unfortunate_events_movie_wikifazv5.pdfIn PDF document text
    • http://denarop.22web.org/24161506076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fd05b0527acf.pdfIn PDF document text
    • http://passive-income.ru/fokewukakugipirilutonavy3pnw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485578/normal_60192f31478b2.pdfIn PDF document text
    • http://dunijekunabov.22web.org/41576321012.pdfIn PDF document text
    • http://znakomstva69.space/free_liquid_diviniumlnw9d.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/ixjahaz/zeravisevasiguluz.pdfIn PDF document text
    • http://rastet-malysh.ru/24701539856u4wrr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xejotapawadi.epizy.com/blank_funeral_program_template_uk.pdfIn PDF document text
    • http://watuginidimefil.epizy.com/kawai_piano_models_guide.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/56482820051.pdfIn PDF document text
    • http://jezawijevot.rf.gd/balian_surf_report.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_off0001d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D33A 5796 bytes
SHA-256: 4efe1adbbbb139dea436abf40e4d1fa40ebf50566723b96df6d9c422578f472a
font_01_sfnt_off0001e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6E5 10984 bytes
SHA-256: ea6da1499f5a01771626893a1522cfb21f16bee804c4fe722c49c46d89000d8a

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