Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c3cb868429263d…

MALICIOUS

PDF

79.2 KB Created: 2021-06-09 06:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5ce9dbcd8c401b7bbce35f6ed40b5b10 SHA-1: e943a9d452a56a3c4cb1a7a84b619867cb92e6ac SHA-256: 38c3cb868429263d7821779ccfd6eb7557bcd8af9fe488b3794765c95d2993ea
156 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 0.9997

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 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.
  • 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://chcial.ru/pbw?utm_term=mp3+tubidy+free+song+and+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413850/normal_600fc73f6eb8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_605d757215b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416510/normal_6015de8baa127.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/muzif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_60262def25c39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5fcddece7a1d5.pdfIn PDF document text
    • https://dimegowogox.weebly.com/uploads/1/3/3/9/133999821/478d7f1b.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/gepamadorobefemenid.pdfIn PDF document text
    • https://wujorimumoba.weebly.com/uploads/1/3/4/6/134676457/malelixuzexogitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_60642b9ed11e5.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/eb9c8d2c-81a8-417d-a05d-cd2d26a99cd3/vintage_project_cars_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb8552c7-c7eb-4629-a660-cb6aaaed763a/fojotagow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b741aa14-a84a-433f-84ba-b03df09e010f/international_business_major_starting_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3868bf68-f297-422e-b540-a1fbefd2a0ea/nekewodala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b3629c0-afd0-40c4-ad45-86ba6e12642d/gibiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8beeb4f4-ee6b-4e00-8c71-ff427c65cf91/partitura_de_adios_nonino_para_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9c868d7-8e74-45c4-b989-6d6582fab359/31039851586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4502720-5b29-4358-bfac-1ab69eff0d5e/checklist_manifesto_harvard_business_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/491fad3b-2610-4b2a-ac88-c356bff63f60/ziget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14c5d57-d5b9-439c-8319-f916df27fe98/stock_market_closed_christmas_eve_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3623b7c-f94e-495b-a665-84e69ea99624/what_is_a_good_weight_loss_meal_plan.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_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 5856 bytes
SHA-256: 767c0a18753c310cbcaf48d261896a7d676cccef7f978941f52ed4b4a6df577b
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 11204 bytes
SHA-256: 5a22aa47e95a072381a5c3771b0bf2ec45200d9e937ca6eabf295a621004b460

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