Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd714e564b12b7f5…

MALICIOUS

PDF

74.0 KB Created: 2021-03-19 19:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e01b572029a35de71dbd83a9190cf38e SHA-1: 581f550ad110d4e8583c4225bd154573c525556d SHA-256: cd714e564b12b7f5cf6960ec1a895c0c90f2eb802ed8863e1d4c00d1fd0cfee7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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://bologen.ru/strik?utm_term=mcgraw+hill+wonders+4th+grade PDF link annotation
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/riwalikufemiriva.pdfIn PDF document text
    • http://dunizajo.66ghz.com/wall_street_journal_digital_subscription_cancel.pdfIn PDF document text
    • https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/valewiteriku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://givoraxanusupe.rf.gd/bio_essence_snail_sheet_mask.pdfIn PDF document text
    • http://jilovimox.rf.gd/an_introduction_to_cardiovascular_physiology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9177af11-72cf-4196-9431-c90f9a23a948/samsung_55-inch_q70t_4k_qled_smart_tv_reviews.pdfIn PDF document text
    • http://vapufebifuv.epizy.com/kejegexemerovegavaru.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/problem_solving_cognitive_psychology.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_7cfa7d18713246ec8585bfc64a862754.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_78db334f9ac34a16bd877aeff19cfbed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec87fb0-caad-4bd8-b4cb-d434c6c04d69/ar_15_stock_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad89b12-af50-4bd3-b24d-1e77d4086f1a/besiwukoxiwetemefuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c47b801-773f-42f4-9379-90f8f2357a0d/how_do_you_use_a_rug_doctor_carpet_shampooer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfba9f2-fe56-438d-94de-cd6e9af4362c/24005813113.pdfIn PDF document text
    • http://fukasutatota.rf.gd/ca_final_costing_new_syllabus_notes.pdfIn PDF document text
    • http://jijopefugowebe.epizy.com/dodipusanulewapur.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_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 5388 bytes
SHA-256: b4273686361753e274b4a6f4290b84d278919c6a201f2f1b4d6e7c8c07601fd0
font_01_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 11280 bytes
SHA-256: b3976b5db6df79e60cd86c7e6338fa3a13efe68b210757521817bfaf7557e8cc

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