Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac6824edb5d85e9…

MALICIOUS

PDF

77.4 KB Created: 2021-02-16 18:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 731c8c6da9855e95f7f20af7b214a8fc SHA-1: 5eaf9eaefccc883c8849eded8d057dd24d8c98bb SHA-256: 1ac6824edb5d85e9f9e9fd2ad388b8d5241fcdbdaffe89e8d8c4c76479fa0637
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation, but the primary malicious intent is derived from the extensive list of external links designed to redirect users to potentially harmful sites.

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://druttle.ru/strik?utm_term=what+is+the+importance+of+sociology+of+education+to+a+teacher+pdf PDF link annotation
    • http://wegixaro.iblogger.org/free_game_capsa_susun_for_pc.pdfIn PDF document text
    • https://ribebofav.weebly.com/uploads/1/3/2/6/132681502/4190535.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/gevividovurazal.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/2042271.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/4365200.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ljaUAhh/auctionzip_williamstown_wv.pdfIn PDF document text
    • https://cdn.sqhk.co/jifonakilux/hjhfi5r/balloon_tower_defense_5_unblocked_ninja_kiwi.pdfIn PDF document text
    • http://lurugusop.iblogger.org/nusiz.pdfIn PDF document text
    • https://cdn.sqhk.co/novexido/5KjgizK/rukufur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalowakudedakov.rf.gd/nogiragemilop.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/73902833396.pdfIn PDF document text
    • http://mitefunigesito.rf.gd/cbs_evening_news_field_reporters.pdfIn PDF document text
    • http://xiriranur.epizy.com/systematic_botany_book.pdfIn PDF document text
    • http://zulejanafub.rf.gd/81063578042.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5684 bytes
SHA-256: bf2e65a578f157f9dc8d19e5c6e0a408508475b91df4ee626185eac23153ac74
font_01_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 10536 bytes
SHA-256: d93e2d7955874f6e4d91fb7bd84a6a6d338ce150c4484937e7f4025053023b1a

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