Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e55ca1058dacfc…

MALICIOUS

PDF

76.0 KB Created: 2021-03-23 12:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 87b3f57a5e78b313cb9bc4af66c2efc0 SHA-1: c53fc741720024f15cbb8221324d872b9750e459 SHA-256: 67e55ca1058dacfc56747308737b02d0a1c3de752c4e7322e1c2a366b3d9060d
186 Risk Score

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 0.9995

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://resalured.ru/wix?keyword=super+smash+bros+ultimate+dojo+locations PDF link annotation
    • http://refoveser.22web.org/what_does_tin_mean_in_banking.pdfIn 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/903fba11-4806-4971-aaa4-df93773f5b9c/teacher_created_resources_inc_answer_key_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/starcraft_2_free_to_play_review.pdfIn PDF document text
    • http://sonunetenigido.epizy.com/gepegemomutev.pdfIn PDF document text
    • http://lepajavawis.epizy.com/resumen_capitulo_16_la_ciudad_de_las_bestias.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/bigeninujusuwukubawakigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d08cb82-ec39-46f4-b579-0d1f0e511ba4/robert_anton_wilson_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2360c9ac-116f-48af-9a31-a245460fd372/fugiweranufasadux.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/25317742765.pdfIn PDF document text
    • http://xizokokov.epizy.com/1447194107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470dce57-32c0-41d6-a2b1-a390ada276a5/the_cask_of_amontillado_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5609ba77-c7d0-4bd9-980b-55225b110538/is_my_weight_watchers_scale_accurate.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_9d054cc8b42f4b848a6448e55b5f2da2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc8f780-c2ea-49d7-a3cd-895b58a1eb88/cordless_phone_with_blocking_feature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c14a0a-8bbd-45e6-a956-2999d34da4b1/how_many_stories_are_in_once_upon_a_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cac3793-8c5d-4f4c-8bc2-d1bc7a0096b1/dozumufap.pdfIn PDF document text
    • http://faxanudof.epizy.com/netbeans_32_bit.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/police_report_crime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4801161-190c-44fb-862b-4dc7aa55107c/brandon_sanderson_mistborn_books_in_order.pdfIn PDF document text
    • http://vijanemafe.rf.gd/satijogubozatotep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109f9832-f732-4e4e-b904-d3994fe20819/80126071790.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_86d0aaf503384a86ab613feca28f71b0.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_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 5632 bytes
SHA-256: 11de7546003860bdbf8c72bc7d186aef72edd81e38f0fbffd579d00f6499df07
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 10620 bytes
SHA-256: ffc7623516e09954b686453c12b25b8fbcf3466477767cf5a90a1d09c0ce4f51