Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f308f8641a924e…

MALICIOUS

PDF

66.8 KB Created: 2021-06-15 12:39:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 75650cb8051610bc31ec94d8bbf0c797 SHA-1: 6655c184ce8c684e27a63f8a86ac943f21136628 SHA-256: 61f308f8641a924ed04f59d06d464cf93859f3028a312d0809c5cff930152143
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and leverages a link farm strategy, directing users to various disposable hosting sites. The presence of embedded JavaScript, although not fully analyzed due to obfuscation, suggests an attempt to execute malicious code or further redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crysiq.ru/pbw?utm_term=blue+danube+piano+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471688/normal_5fc5a66dac335.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4491168/normal_60b000f425296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_606b9ca4c5e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482190/normal_60c0c16a60055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fe3621ad1645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_60500dbc15782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_602c2dcbcd0b5.pdfIn PDF document text
    • https://tebelusagunesaz.weebly.com/uploads/1/3/4/3/134318259/768f4d74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fff6a9eb2efa.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/49b9f.pdfIn PDF document text
    • https://seruvexude.weebly.com/uploads/1/3/4/4/134404645/54c0b77c54a0a6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamewariz.pbworks.com/w/file/fetch/144898404/why_is_passive_voice_used_in_scientific_writing.pdfIn PDF document text
    • http://juxivos.pbworks.com/f/bilagejibomimaruguzojabor.pdfIn PDF document text
    • http://legesir.pbworks.com/w/file/fetch/144827496/english_spell_grammar_checker_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66db2bc2-c5c7-4162-88df-6f8ff855c54d/autotrol_water_softener_website.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/f/zilugemiwetenojusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d1a4cb-2ddf-4093-9afa-979f4c92f679/29967779547.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/f/majesejumokagagewikixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5ba663-baba-4b2f-8cf9-68cde7ea7e43/richmond_water_heater_12_year_warranty.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 4952 bytes
SHA-256: 3c6d7e8b5b94b956815c7f3073c0faefb667beef85afd195cb0935df878b74bc
font_01_sfnt_off0000d9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F8 10632 bytes
SHA-256: 5a7a503a3c977bdd103f1aefffe983ef9ab0bef1f13435d32eb84bf1f647a5d2

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