Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d69c8e8b097482…

MALICIOUS

PDF

83.9 KB Created: 2021-03-28 13:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d3edf558fee2a4054d98425ecebcc3f3 SHA-1: a95face92f9e4bb7f4a3865a04a243ca8c4ff6f0 SHA-256: e1d69c8e8b0974822e4d9b72aef3d114f6ffb7ca33ceeda88b7383513aad680d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URLs pointing to various PDF documents, likely to manipulate search engine rankings or redirect users to phishing sites. The presence of multiple disposable hosting domains and UTM parameters further supports this assessment.

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://pelibifir.ru/award?keyword=adjacency+pairs+pdf PDF link annotation
    • http://smeh-mif.space/dazir1phz3.pdfIn PDF document text
    • https://cdn.sqhk.co/wogigixa/gfiggdi/vatodipoxotemijoguxi.pdfIn PDF document text
    • http://wokadokifoxesav.22web.org/physics_holt_textbook_answers.pdfIn PDF document text
    • http://pajiweputuniwas.iblogger.org/turatasopawamavi.pdfIn PDF document text
    • http://misstourist.info/what_was_the_aim_of_the_bobo_doll_experiment083a0.pdfIn PDF document text
    • http://physcoo.com/lesokijolodutzmvdh.pdfIn PDF document text
    • https://cdn.sqhk.co/lipebefaje/5gcJ2Ri/roxefunawexibisexavubo.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/fifRgjc/88315139177.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/mantis_tiller_for_sale_uk.pdfIn PDF document text
    • http://prizinsta365.online/raludonoxexelt4bfj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_7cc26e3ca1774d988eea1c6675e9fdb5.pdf?index=trueIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_7d1eac386c4a4f89b95d08449d6d4a44.pdf?index=trueIn PDF document text
    • http://nasutewu.epizy.com/cheddars_nutrition_guide.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_e88897d0366e455a8389d817b6b473a0.pdf?index=trueIn PDF document text
    • http://waxivetik.epizy.com/xufed.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_45a11fd08da64637af3d6ec7ee2c0bf6.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_1b6a8790fb554fdbb826a81f5f156038.pdf?index=trueIn PDF document text
    • http://jowokepo.atwebpages.com/bv_ramana_mathematics_free_download.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_2322ac528a6740ac9ab5acd88a4c6729.pdf?index=trueIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_3e96d6ac11fa4f45b938e20a39045303.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_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 5284 bytes
SHA-256: 7d9a382fcf86d7e837c762277e5a17a8901c12425c68d28a8ca20c03346882a7
font_01_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 10664 bytes
SHA-256: 5f55363b07b21d56d97b8d7836807fc71185e177c4b24cead73db3ed879276e6

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