Malicious PDF — malware analysis report

Static analysis result for SHA-256 530dac6554c47924…

MALICIOUS

PDF

79.7 KB Created: 2021-05-01 23:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2faa77dbd08c538b8b50b842d155e880 SHA-1: c731ae05a8ad4ebb334f2d8a0f38e68c5fe95823 SHA-256: 530dac6554c479249a25700a41199bda92de1a2186b3560465f900caac1df901
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be a lure for external resources, likely to distribute further malware or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://xezojetit.ru/strik?utm_term=20+love+poems+pablo+neruda+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379841/normal_5fcce1bcbf0b8.pdfIn PDF document text
    • http://fosubudex.iblogger.org/classroom_language_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/hb5jgNy/bloons_tower_defense_5_unblocked_games_66_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/jhL3EmF/83622532506.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/1NjhNhb/fudiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461751/normal_6044e1695ff22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464739/normal_60032209b5057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fcc55fcb6de9.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ac9hjjf/castle_of_illusion_remake_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/lcih8ge/6582096549.pdfIn PDF document text
    • http://rurojewof.22web.org/33433293040.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/0AgdBgg/free_table_tennis_courts_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vemunaxudug/hfjhaih/pathogenesis_of_rheumatoid_arthritis_review.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/hdxMhfZ/evolution_2_battle_for_utopia_hack_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_89056de134cb435db125adbe3479d3a2.pdf?index=trueIn PDF document text
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_3b510179f67a47069521661deba7fa86.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/485d7412-a4a1-4582-8564-5e5dcdb62707/sutizesokobufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc08e8ea-1c78-49d7-9e0e-100d5c0573da/40896765921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78c074c-98e5-403c-a6d3-f3b82b023f8a/nuludolo.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_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 5564 bytes
SHA-256: f76714fb9c97863e09c8b0a0157d837bffa8aab94b701b90a6c9b907ab4ed821
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 15960 bytes
SHA-256: c94f4968bc5a7a1e1424b6ddd462a8905c30a2d396bb177ee834697556ce9162