Malicious PDF — malware analysis report

Static analysis result for SHA-256 4effaf04c5ec77b9…

MALICIOUS

PDF

73.5 KB Created: 2021-03-10 23:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b900780e0295c8825e72d4a3668f05f7 SHA-1: f3f592eb264f3c3b0799de325714442d6ad47a18 SHA-256: 4effaf04c5ec77b97153047e8c19d0772d086a94b8288cac3ee283932f780b7c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are embedded within the document body and presented as a link farm. The primary malicious URL identified is golowaki.ru, which is likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/123?utm_term=compressing+pdf+file+size+online PDF link annotation
    • https://gulezawajure.weebly.com/uploads/1/3/1/8/131858287/6600338.pdfIn PDF document text
    • https://gumotamilo.weebly.com/uploads/1/3/5/3/135319527/5236309.pdfIn PDF document text
    • http://torixobo.mypressonline.com/lasorixanokav.pdfIn PDF document text
    • https://bolegabafewibe.weebly.com/uploads/1/3/4/6/134651697/8133160.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/peduvobinotarowako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5ff772c8b4778.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/dixozoligisejuzobejanoro.pdfIn PDF document text
    • https://wixufefiwu.weebly.com/uploads/1/3/4/8/134883310/vokomudufodi-fafuzifipeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_603a8630a4f2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_93451bff04a044cbb9d831e0be376cba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daniwodug/kadamban_movie_hd_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/hovercraft_mini_project_report.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_7586af03c5ee4db1afc576531b5a3db4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nefunupu/pedororuxefazexelisuzog.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/is_life_liberty_and_the_pursuit_of_happiness_a_constitutional_right.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/informer_amazon_prime_imdb.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_5e5e12bfef1a43a4b68233510f0d2f2a.pdf?index=trueIn PDF document text
    • http://tavamikilav.myartsonline.com/lororedozatevus.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/partitura_de_hey_jude_para_piano.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_06219a64b965422babe35efd49dd0795.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gitipelut/57638645933.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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 5108 bytes
SHA-256: b24b5053661628a5db481b973006b8d7eac87a75dc96abd979c634fbdc69798c
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10820 bytes
SHA-256: 50614bdb1a1b63894f4c0f9b02c5e0e15b97229595f0242c35b5f3fb395f5d62

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