Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b7ad8f01606f8e…

MALICIOUS

PDF

73.1 KB Created: 2021-02-18 16:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2819e7df2664403f054c4242bea8d82e SHA-1: 14e00fc14989edbdc79219af398fffa2f8cc39c6 SHA-256: 66b7ad8f01606f8e40c0796bdcedb6651837e5712792e53a6ab2370b0bcaa13a
126 Risk Score

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 embedded URLs, with one prominent URL leading to a site that appears to be a redirector for malicious content. The document body, though heavily obfuscated, suggests a lure related to a movie search term, likely to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=sex+and+the+city+movie+imdb PDF link annotation
    • https://cdn.sqhk.co/tipusuzog/ieicjic/28775216918.pdfIn PDF document text
    • http://tryse.xyz/formation_aide_soignante_cours_du_soir_bruxellesyfw7f.pdfIn PDF document text
    • http://ek-arenda.ru/voxisezejx7xii.pdfIn PDF document text
    • http://btsworld.org/36495509360eddyz.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/slhiggH/download_game_helix_ball_drop.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/fakivatezu-pusewona.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/fcVmie3/entry_level_marketing_jobs_hiring_near_me.pdfIn PDF document text
    • http://creditscoretrack.info/61083414863c5i62.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/jfihhju/free_pinball_games_for_laptop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/vemubikunazelaxenisojak.pdfIn PDF document text
    • http://nemusif.rf.gd/mupivubarimujelu.pdfIn PDF document text
    • http://wilikomezavute.rf.gd/what_are_the_top_10_wii_games.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/69912877494.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/99057727027.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/iata_airline_profitability_report.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_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 5344 bytes
SHA-256: e3e2f83c52a0243eeab56f8562337f6b7ae7ffc75121371715e558331db40cb1
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 10792 bytes
SHA-256: e6059618cb1c65ab0a2e90283de096cf10420c4eb7db60d7cef4de8de8dc424b

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