Malicious PDF — malware analysis report

Static analysis result for SHA-256 b351461c4b324236…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 05:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c47269d4abb97ba8412cb46d3d5809d6 SHA-1: 91b5248d556e540454bd1a4d571eaacf185d1883 SHA-256: b351461c4b3242364cd9423547eee35c240038d1ed22321fc19e583d3145645c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are disguised as academic or informational content, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate that the document is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=america%2527s+history+8th+edition+chapter+1+outline
    • http://zisezamerares.mygamesonline.org/descargar_comic_batman_the_killing_joke_espaol.pdf
    • http://zesenadozefut.sportsontheweb.net/banking_diploma_books_free_download.pdf
    • https://cdn.sqhk.co/bexuxoxabim/cgf4ije/drive_in_movie_theater_nyc_halloween.pdf
    • http://tiwirodizefa.iblogger.org/bone_setting_techniques.pdf
    • https://cdn.sqhk.co/sonawumi/3sGhaXl/ziwabaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sizabo/66074981771.pdf
    • https://s3.amazonaws.com/sojebelevenex/1686481674.pdf
    • https://s3.amazonaws.com/sazixipame/how_to_get_facebook_recovery_codes.pdf
    • https://s3.amazonaws.com/pipaneku/98069911991.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_994e7d846bd248bab350e32b17ad1bba.pdf?index=true
    • https://s3.amazonaws.com/fapaga/89867739350.pdf
    • https://s3.amazonaws.com/xapijifas/aruba_iap-_103-_rw_manual.pdf
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_53573dff90db48c29cf4d784ac9b55ce.pdf?index=true
    • http://guwajip.epizy.com/a_suitable_boy_book_review_guardian.pdf
    • http://jefuxizimume.rf.gd/gidevanuregabuvuxipafaf.pdf
    • http://gemovimuwopete.atwebpages.com/surelovenanofegupowizen.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/wugadibisa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eecf.bin
b0f30f77b03c01731de63398c08cc05fbe0ecd4bb38dc985d0df38da1e6ffc2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5684 bytes
font_01_sfnt_off0001020e.bin
d1587c390bf8b154ca6c71dbc10b1fb706f5a9761d6195758fdad2aed6ad0609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 11668 bytes

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