Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7181883b0fc2e73…

MALICIOUS

PDF

73.8 KB Created: 2021-03-11 23:02:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f90689e9881a4ecee32c95d24af89b8b SHA-1: 5390844ccf6b635c5b1f8721d4dfb5b9f1e8df4d SHA-256: f7181883b0fc2e73e7842d0f6bbdc518f6b2953a1c0a1224f2852a7a6ec31ec1
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://resalured.ru/123?utm_term=c+technical+aptitude+questions+with+answers+pdf PDF link annotation
    • http://dololebajug.scienceontheweb.net/49518783672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd670842c432.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/hfhi9g8/tetubojesobovet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_603c397155781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393208/normal_5fe60c10933d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_601d9f7599fb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_60378fce44c3d.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/functional_food_journal.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/HihqgiJ/jimu_app_not_working.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412181/normal_6002c0ecbaee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426087/normal_6004073e4a253.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/872891357.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/iegelPj/great_battles_medieval_pc_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_7642256f02764d1781671afd5e4eecb4.pdf?index=trueIn PDF document text
    • http://xiwexuxe.atwebpages.com/bavenonuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0172225-917c-41c4-8951-30ce5304dbde/bulova_precisionist_96b175_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e660fe59-ac2f-417a-bc08-003bc6589b16/nuwatosekisojiwenu.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_6b741afcb1c143f6ba970667d8fb46b6.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_99a2bc4e1edf4ed8a457671beaf1cada.pdf?index=trueIn 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_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 5368 bytes
SHA-256: c4cf140ea9b4769f4b1a5e043d0f5f5d346aeaa2886c0af1914251a8c650b014
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 11340 bytes
SHA-256: 1253ff8b05b5aba2ce83a7170258fbf9ace8e0e15d9601e73ca6cd6ea56a5f63

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