Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bebf52358c28582…

MALICIOUS

PDF

79.8 KB Created: 2021-03-07 02:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8ef163d5d04c7a263b14b437626c938f SHA-1: fa5d96adb995b152fd9983c8b169bfd866fcdf50 SHA-256: 5bebf52358c28582492f5c30e825a5695ccb63cc6f64884426a9325b1789aa9d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or scam attempt. The document body contains garbled text and metadata related to 'wkhtmltopdf', indicating it was likely generated programmatically to host these malicious links.

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://leonvi.ru/strik?utm_term=interior+design+classes+online+free PDF link annotation
    • http://topagut.iblogger.org/vmware_player_14_pro.pdfIn PDF document text
    • http://copytoshka.ru/what_does_the_bible_say_about_being_all_alones4q3z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fcba1521daa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6031111cbf1b0.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/iijaoke/1004120035.pdfIn PDF document text
    • http://topcreditreport.info/whats_another_word_for_conventional_currenttrl8b.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/dgfF3hj/finger_guns_touching_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/ctjcGjh/xawekufilefukabijozuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5ff61f21bfa75.pdfIn PDF document text
    • http://axecheat7.xyz/kenwood_dnx5120_price9298u.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/iigigia/disney_heroes_battle_mode_characters_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/dasulujina/hc5iiGc/digfender_level_60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_8e64f6250ca648d3997f1ae7b3e1778f.pdf?index=trueIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_0121fd48caa842639c04c711b0d33015.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_3643d26a231a40079b16c33672d98a9d.pdf?index=trueIn PDF document text
    • http://lozufoxozaniso.rf.gd/arch_linux_manjaro.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_294893fa57d34ab1a66cbd47625e2023.pdf?index=trueIn PDF document text
    • http://kojorelivav.rf.gd/36061759114.pdfIn PDF document text
    • http://wafovon.epizy.com/4720494540.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_92bda24559eb4ea9aee0995661e1af09.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 5128 bytes
SHA-256: 266dad67f9c432dd63b076a45a6aee973350a0a838b9ef7ae98bd639e3c0eae6
font_01_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 10528 bytes
SHA-256: 4e591734f6f468597e927f31fc23d77c7aad66a9048770d80f391d409b34e09b

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