Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05c24877b6a45db…

MALICIOUS

PDF

76.7 KB Created: 2021-06-06 09:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0ce8a08a3b1a4e26c92b301ab9edb675 SHA-1: 9ecca8ad063a2bd51dad6d52746c9274c8a8a951 SHA-256: b05c24877b6a45db87cb17ab5410996a597dcb8666f729ee10436820478621b0
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 0.9991

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
  • 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://medvor.ru/pbw?utm_term=barbie+in+a+christmas+carol+full+movie+in+hindi+part+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405440/normal_606386f75e1ed.pdfIn PDF document text
    • https://zujogomute.weebly.com/uploads/1/3/1/4/131483029/dotoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5fc9c273ec6e5.pdfIn PDF document text
    • https://vusesuke.weebly.com/uploads/1/3/4/7/134723580/766a17d8dce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449405/normal_605c5a5db9674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_6030087ee0d77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453329/normal_5ff686a751e3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedajawi.pbworks.com/f/13477238755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544ef1d8-2a63-494f-9c6f-44015fd989cd/58397143587.pdfIn PDF document text
    • http://kedajawi.pbworks.com/w/file/fetch/144611607/92870979639.pdfIn PDF document text
    • http://jutopar.pbworks.com/w/file/fetch/144653499/liwexopirexofopoz.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/what_is_ethnography_research_method.pdfIn PDF document text
    • http://xuladejuzor.pbworks.com/w/file/fetch/144553425/feminist_forgotten_fight_free.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144687192/70792573781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a573604c-c472-442a-bfa6-ec38decd92c2/how_to_tell_how_old_my_trane_furnace_is.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2d67b4-d993-4e8a-a1a7-03b3aa1e4273/ford_7.3_diesel_engine_wiring_diagram.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/84494994681.pdfIn PDF document text
    • http://malamojozag.pbworks.com/f/american_history_apush_textbook.pdfIn PDF document text
    • http://nagaxop.pbworks.com/f/37639550266.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/home_depot_truck_rental_san_antonio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1469179f-3b77-4ec5-bc25-f5b7586ad837/10675214571.pdfIn PDF document text
    • http://fagimox.pbworks.com/w/file/fetch/144513927/how_much_does_a_correctional_officer_make_in_san_antonio_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37718f34-b7e8-451b-b2ae-64446486f79d/perudibaluvewujumi.pdfIn PDF document text
    • http://buvulareka.pbworks.com/w/file/fetch/144616782/essay_linking_words_exercises.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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 5732 bytes
SHA-256: f7efde4d999385f61ef9f8e81e0bfd3226f7833fb63a5617cb2bf6661eadb71d
font_01_sfnt_off0000ff7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7C 11056 bytes
SHA-256: c60897f0af74f03deaf5041c6d7dcdce8189b3f1531a633f9d27d07aed137831