Malicious PDF — malware analysis report

Static analysis result for SHA-256 188f3dbdae949941…

MALICIOUS

PDF

74.6 KB Created: 2021-05-02 20:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 664909ebf4c2c9675849d8adc3eaabfc SHA-1: d70b4228cd9cc03e7e7dfcbc1a85c6796228fa36 SHA-256: 188f3dbdae949941970b2a81a10014540f3c0cdac2b2b42e6fe3230c45ec4785
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=how+do+you+make+flavored+simple+syrup PDF link annotation
    • http://uber-global.com/is_ryobi_a_good_brand_of_tools65a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5ff0a72577942.pdfIn PDF document text
    • http://begdas.space/digital_design_and_computer_architecture_solutions_evencczu4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6016fcd713e6e.pdfIn PDF document text
    • http://vas-rem.ru/131785662411kq9t.pdfIn PDF document text
    • http://salonhq.xyz/399695142442mf56.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/igptha2/sherlock_tv_series_wallpapers.pdfIn PDF document text
    • http://hookup666.site/ordinal_statistics_meaningigddz.pdfIn PDF document text
    • http://chestlune.online/daoc_midgard_leveling_guiderxz8z.pdfIn PDF document text
    • http://bonboxstudio.com/how_to_change_name_on_nortel_networks_phone_t7208dnxgz.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/iihd4ih/42750412563.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/qiaGOsf/slither._io_hacks_extension.pdfIn PDF document text
    • http://matteset-spon.space/mass_moment_of_inertia_of_cylindermkkgc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_5fd6735d218cc.pdfIn PDF document text
    • http://samekado.22web.org/4993514774.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winigoset.rf.gd/english_language_diagnostic_test.pdfIn PDF document text
    • http://pexalezevedizaj.epizy.com/30283707499.pdfIn PDF document text
    • http://tudafaketewud.rf.gd/dave_brubeck_take_five_sheet_music.pdfIn PDF document text
    • http://kefekebew.rf.gd/13453505850.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 5468 bytes
SHA-256: 325826b0a48169205940a00a7bee18abc000a2edc1c2681ec5c404ebf27cfe6c
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10792 bytes
SHA-256: 94548b430fb1c5ce840f67eeaf59e80065e491dc702151ffdc5f241755bd03c3

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