Malicious PDF — malware analysis report

Static analysis result for SHA-256 4283496e692fbf4e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-15 11:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1712e97dc0277ecee5182ea6eb064437 SHA-1: 54008c490be4f8bc2d3e1d33e6561029a282bc9f SHA-256: 4283496e692fbf4e31ef0c64de7c173873bd7c5fe98a76a71b2bcf9d4f81ab40
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The embedded content, though heavily obfuscated, appears to be related to search engine optimization and potentially malicious redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=pitbulls+puppies+for+sale+in+california PDF link annotation
    • https://cdn.sqhk.co/tipefimex/cgd1jhB/83296727531.pdfIn PDF document text
    • http://lukufogud.getenjoyment.net/tokogavixan.pdfIn PDF document text
    • http://sale20.site/rodukadanenzige7.pdfIn PDF document text
    • https://dafebifu.weebly.com/uploads/1/3/4/3/134399244/xikedigarizukawapu.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/992970d1db78d.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/arithmetic_reasoning.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/flute_quartet_free_sheet_musicyf2p3.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/bFgjjfE/67441271513.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/1640774.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/gif1mgg/face_mask_around_head_not_ears.pdfIn PDF document text
    • https://cdn.sqhk.co/nedovipirumu/8ihv0Nm/7778511641.pdfIn PDF document text
    • https://sivusizawijavoj.weebly.com/uploads/1/3/4/4/134482483/puwop.pdfIn PDF document text
    • http://medgaj.com/aaru_movie_songs_comuc6tx.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/0127349c-f729-4419-a494-dd57664c29dd/eurydice_play_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d915ded-61c4-4bdb-9858-369019d620cf/nejitogarijisekaxovuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c6cb613-6384-4f23-9759-5cc39ce16892/sukodakuninosalezize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5a5e7d-cab6-4b9f-9697-998c353b2d84/mosen.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/piduvulaxuzakepa.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/wisidofanadiro.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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 5152 bytes
SHA-256: 05b1c6b8eb621e483dcea9f70bfe28e8495da96a5f8121484da95131ef7ebe81
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 10824 bytes
SHA-256: ddd02194111457c55455f62a129cae47532049c95483e18d3865c5a31162b461

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