Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f3688de0f5dcd7…

MALICIOUS

PDF

90.2 KB Created: 2021-06-15 10:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e021c32912d46ef44bc2dd68c81d3940 SHA-1: 47bb27cd7dbf8c717ef6afa126bc7c51cb15a6a3 SHA-256: 87f3688de0f5dcd74d945529bdba4cc5369a3f9ba09bc279e06b8a876ae13494
126 Risk Score

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 0.9985

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://synerhu.ru/pbw?utm_term=beyblade+fierce+battle+movie PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460694/normal_602ad8843cd1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5ff2959980fb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gozigelogani.pbworks.com/f/super_famicom_rom.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144988209/animoji_iphone_x_emoji_apk.pdfIn PDF document text
    • http://kigemulu.pbworks.com/w/file/fetch/144564936/koxom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56b274f-5f5c-4310-8578-c78c1e9dd15d/tebotegixalirefeluribo.pdfIn PDF document text
    • http://juzifezazuk.pbworks.com/w/file/fetch/144887703/awm_gun_ringtone_download_mp3.pdfIn PDF document text
    • http://lewiwebula.pbworks.com/w/file/fetch/144752283/what_is_green_revolution_explain_in_hindi.pdfIn PDF document text
    • http://vowetegaperi.pbworks.com/f/jobless_reincarnation_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f1a5b8-76ef-4a22-9720-854841f5e7e7/what_are_the_objectives_of_a_business_plan.pdfIn PDF document text
    • http://kiwazotomija.pbworks.com/w/file/fetch/144648579/sample_recommendation_letter_for_employee_from_hr_manager.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/denton_county_tx_criminal_records_search.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/51294635211.pdfIn PDF document text
    • http://vakerul.pbworks.com/f/jevin.pdfIn PDF document text
    • http://dipazuwawex.pbworks.com/f/el_perdn_spanish_song_mp3_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd47b13-c71f-4e6d-a4de-900d9c5cca4b/79798947032.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/werofeginabulogoxulelodok.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/supax.pdfIn PDF document text
    • http://jowugaredite.pbworks.com/f/teoryang_formalismo_halimbawa.pdfIn PDF document text
    • http://tugufumoti.pbworks.com/f/zamofariwu.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/w/file/fetch/144607464/9335841884.pdfIn PDF document text
    • http://radejaki.pbworks.com/f/58049802509.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144750186/87135731367.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 5256 bytes
SHA-256: 4fb454afb3addf5da602f582cf64811cfb520e2b4bf1e5141c7494e65bd0973c
font_01_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 5020 bytes
SHA-256: cc87af4adea30b51f8442a9eb5871e1b4466cc039c3d1512dc760f771d83ab08
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 12148 bytes
SHA-256: de9485a75792798bf94dea042915899d3ca267df7ac821b7f5586d3bc8e87099
font_03_sfnt_off00014c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C91 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f