Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3af10098c0f0865…

MALICIOUS

PDF

75.1 KB Created: 2021-05-27 15:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5587c86b61825329529b51b4276fe68f SHA-1: ce792a0b163eaa705f792bf81df2c49e70e27a9d SHA-256: c3af10098c0f08650ec4f0c3ac2eee0821e455a7e76562fd38722dc08225f8da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=will+hunter+x+hunter+manga+return+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5fc9e94cdc6ca.pdfIn PDF document text
    • https://xedenuxukufokar.weebly.com/uploads/1/3/4/5/134522900/xezaxi_sadabuw.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/808bfb39d2915e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449614/normal_5ff6b94d5e7db.pdfIn PDF document text
    • https://limosajabug.weebly.com/uploads/1/3/0/9/130969130/wekugovadizorufaje.pdfIn PDF document text
    • https://desijikero.weebly.com/uploads/1/3/5/9/135964668/mozawakadoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486765/normal_5fe9110a2e953.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/a63618893.pdfIn PDF document text
    • https://gaxizizobepebi.weebly.com/uploads/1/3/0/7/130740618/zufonaj_fodifopeb.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/b5b3abf7-128e-485f-bd1c-d3b6d818e523/wenefele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb6de6c-0438-4a8a-966c-60186cf605a9/girl_scout_daisy_good_neighbor_badge_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a14006-60b7-4990-a25b-0984a39e357e/10th_class_physics_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9121c59-b878-4841-ae3e-5bd8f3f21722/the_raven_remastered_ps4_trophies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3f20d5-a3fd-49be-94d7-e72a9372ceba/gapuzegofunodako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eede4e52-8d7a-4cf8-a0dd-96b309514e18/51081238428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6b4599-173b-4542-a6ea-e3ef4cc4020a/55570414517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ea19f3-887e-499e-ab9d-34ff4d4a5ff8/womubamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032c4b22-db80-417a-b72d-8d22163af8b6/option_trading_strategies_book_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247f90db-16d3-4af0-a090-3613ad477da2/34936991710.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_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 5276 bytes
SHA-256: 17f1be911ccc878903f18851e3986f4861ec737ab0f84ef192593bf0495b9254
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10184 bytes
SHA-256: 252370673c9d28ab0d86051cc6569ddd4775cc28cd0ac8d9eb8afebe3747c1f8

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