Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3146f3beea89b5d…

MALICIOUS

PDF

72.9 KB Created: 2021-05-22 09:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e042725cc5000a96917d848537d8f63a SHA-1: b326c255f946261c0c6a7133f0d1aa22f1ab99f9 SHA-256: c3146f3beea89b5d6aa3c610cb5014859f231a3eacfb545301501b42177ee112
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=how%20to%20do%20find%20the%20volume%20of%20a%20cylinder PDF link annotation
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/xewanepagutoroviget.pdfIn PDF document text
    • https://relakurofur.weebly.com/uploads/1/3/4/8/134872141/3080908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_6025a4d5af3cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fc8fe913e2db.pdfIn PDF document text
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/geganoxuraf_gajufumab_rokonofokilijif.pdfIn PDF document text
    • https://jitebosezukazup.weebly.com/uploads/1/3/4/1/134131420/5400375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_602482d55171c.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/moxuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_6005a14f9400f.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/fd590c88-b6c2-4b3c-ba56-85b8b8ed0dab/jofupuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4a80a9-9ebd-49de-b5c0-aeebddd49ad7/hayward_w3aqr15_aquarite_electronic_salt_chlorination_system_for_in-ground_pools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/038cf1bd-e8b2-43c7-aa27-0ecdf88958e1/rich_roll_finding_ultra_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc47b57-f9b1-4bee-a8a6-77bf0c48705e/vinedokeridusivosopibuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78671b08-8182-4666-b5cf-00e91724a467/sovoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842a6559-61b1-4b43-baf6-489e21f0e6b0/360_degree_leadership_survey_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5faeed63-dde3-44cf-bc88-20addab8fbb2/wuxutatolojadutogawuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799a58ee-8056-4535-9f3e-b40ed9de9f2a/is_sword_art_online_coming_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17a007d-660b-47a3-ada8-5346a413f75f/7560383680.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 5296 bytes
SHA-256: bd586ee763619df9670e689095f4d01cb97b3af486417b5e97d956920b089a54
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10856 bytes
SHA-256: 14fc9c66da24c6014ec13428e1f5b8470ddfb950690a56da216a587efa53e981

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