Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2b9c5eab910d11…

MALICIOUS

PDF

75.1 KB Created: 2021-06-08 14:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 605965275c29a2b621f92c18b229fe6e SHA-1: 563d7f73be0af9e5309d64a7053e05e375efd617 SHA-256: ec2b9c5eab910d11b1187bdac9c9ae52ef3394dfcfd124ad513ab760adbaa6cc
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 0.9997

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://pixomot.ru/pbw?utm_term=ms+office+2007+free+download+with+product+key+full+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472208/normal_605534d7c8ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489035/normal_6045dcccb1554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453906/normal_604c99d6a52e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_604f83cc0f3b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_6037468410c5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21e65e9-cdf5-4d22-89fc-678589e2135b/navy_advancement_exam_schedule_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d4d09f-cf8b-4cdc-8ed2-6cdb09571bc2/edo_names_that_start_with_o.pdfIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144569655/kukawowimipitarexewo.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/25393782022.pdfIn PDF document text
    • http://supijexed.pbworks.com/w/file/fetch/144585981/ielts_general_writing_task_1_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e83bee28-02db-47e4-a291-07736fbe8b1c/firanixiwib.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144732618/lobevebowufivobiroxot.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/w/file/fetch/144580194/46983901861.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144616377/88503130175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed463b08-ce97-4862-b139-c111d2f3f6ab/60910966847.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/69698334473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe0a8f8-4406-433e-b89c-14ede0a6e46b/fovorelotireferariba.pdfIn PDF document text
    • http://buzivevej.pbworks.com/w/file/fetch/144784740/lomemizomipuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e59a89-5f3c-4041-a82d-0426758c49fa/what_is_pp_corrugated_sheet.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/51611864624.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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 5920 bytes
SHA-256: 1cfb7d4461853cd84d05050351fa944083673da67e7f179c6e9f691ea5182317
font_01_sfnt_off0000f914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 11008 bytes
SHA-256: d8e0cc1446e71249a0ca3d637a8f9680e5703e9ed6eaa9ef918ba770522f777c

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