Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1b5227c9448b8d…

MALICIOUS

PDF

73.8 KB Created: 2020-12-04 06:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c64bd6758572b04e9ac0215959b0e61c SHA-1: dfba2a3c665521ba8071e5eb656e75b40e074b76 SHA-256: 0b1b5227c9448b8df3b551b0393417d4c43902499a5c23a7c3316445c79faa6e
156 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 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=the+neurotic+personality+of+our+time+karen+horney+pdf+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5fad53eacfac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5fc148923ff06.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/lugolomowuxotegov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5fb82633b255b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5fa037822c2d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vetamedisoz/96488876925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f2fc91-7d1c-4fd5-94c0-c804aea2661c/entrenando_a_papa_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f11fdaa3-d915-4f72-970b-38e1c8c2096f/84641390634.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/davizerap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e78249f-d2d1-4469-af02-8ccf5dc8de22/kawinikanas.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/25969213089.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/voice_recorder_free_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183876a4-abd5-4676-9be1-1929b8bdb74f/buxakezupepibipurum.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 5604 bytes
SHA-256: 207e7baa154f9248077274fb90ed81b74b32a0d154146bb30bc1e82bdc612c4f
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 9960 bytes
SHA-256: f22950dfecb4e0fc35eb0a59467dda72d7f2ab8be044cb8b5c00bb0e844bb9b9
font_02_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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