Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d154060a9730780…

MALICIOUS

PDF

108.2 KB Created: 2021-05-26 19:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 56550fa5cb82007da22c4ed11a399e2c SHA-1: dd83a2a2d8da66cab6aceab96de7990c5c70b42e SHA-256: 4d154060a973078012cb74b211fa12e90a327f1a07776ef19160ebe87facd791
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 0.9994

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://kuzutuzo.ru/strik?utm_term=hoja+de+respuestas+raven+avanzado PDF link annotation
    • https://fadejumiz.weebly.com/uploads/1/3/5/3/135349507/mudil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501380/normal_5ff256d78620e.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/0d7730f1239e4a.pdfIn PDF document text
    • https://tofibozuliven.weebly.com/uploads/1/3/1/1/131163910/3368733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_602e2dd69ccc7.pdfIn PDF document text
    • https://sexedevojaboto.weebly.com/uploads/1/3/2/6/132695366/tilefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_60064159be900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388282/normal_5feb25ed78827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_6048ef612dc2d.pdfIn PDF document text
    • https://kojulijorivo.weebly.com/uploads/1/3/4/3/134329781/memiba-xokoje-nebokudu.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/kagetalev-wolatuburetefoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_605f91a132c5a.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/663801ee-4fca-4c14-81f5-728003e83446/diruzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd43b058-74ae-41a8-96ff-c50fd4c71e6e/1225117694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523a58b8-846a-4fad-9d77-a7b3a594e8b3/to_all_the_boys_i_loved_before_cast_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91046995-cdcb-47d0-a974-4f4ad6891228/pampered_chef_grill_pan_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52062a2-348e-4884-8430-722315504314/vuvegugilirulilitaxixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d37a7a-3adf-4a5f-b465-8be01f92763d/flash_required_for_recording_video_canvas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A1 1796 bytes
SHA-256: 3810fd104205accc497b65b6493d34032f56225bd223a052031be9478eae4f0b
font_01_sfnt_off00016275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16275 5068 bytes
SHA-256: 60e3e8bf006bf2e9626667d3b53d452d7cfa07ba1e97b53daf4236133be74d14
font_02_sfnt_off000173d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D3 14416 bytes
SHA-256: 26a02bbf51d64aba10134beeb858b2fa872bac25061992568488281d945a79f8

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