Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaefd76eb6029417…

MALICIOUS

PDF

91.4 KB Created: 2021-04-20 08:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2bb9ec8937d50a4d302adaef035886a9 SHA-1: cd8171edf090392c1639b647141a7f4f478c09af SHA-256: eaefd76eb60294173ea6ebb63e7418f6773ccc3238f1270e237b594cd9f15e2a
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://golowaki.ru/strik?utm_term=the+quiet+american+graham+greene+review PDF link annotation
    • https://vekosakebasagi.weebly.com/uploads/1/3/4/7/134743747/kegijeresadored.pdfIn PDF document text
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/4951209b4.pdfIn PDF document text
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/tagog_lepuwavuter_nipetukadosin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_60446a935c02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427076/normal_60630e61096fa.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/589296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_600e38112466f.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/201ca.pdfIn PDF document text
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/b1403.pdfIn PDF document text
    • https://gekojufoj.weebly.com/uploads/1/3/4/4/134438070/1218062.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/ffbc74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_143a13b135d3445c99279ae08cafd1cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66be64b3-9ac7-4955-99e0-a0e388d131ac/godavekugogudukisategi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0df9763-b384-44cd-98b2-5c1f11fb052e/72759801487.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/when_do_you_harvest_sweet_potatoes_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df8257ae-6fe7-46a4-817b-d942a99c9584/gafutedagofegizosoful.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_4d23eb43539844439ae0089da36dc480.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c7287b-641c-4fa9-a7ab-d79664dcef27/46986105073.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_84e357a895e84f9e9ad290f3c815eea0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rowubunak/high_ground_enterprise_ltd_balance_sheet.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_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 5228 bytes
SHA-256: 16bf52a2d8ef04ec414874870259dd2d5f3912757602c4c9efbc8441d16a5e7c
font_01_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 11768 bytes
SHA-256: 9b3e120337f73c64e687c54170f7ae2320b5f1e86298e04b56dd85aacaa2030a

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