Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3f93aec87e7492…

MALICIOUS

PDF

102.5 KB Created: 2021-09-16 00:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1b31296f0dcc1acdebf998eda3eca7d SHA-1: 78993fe5381a9b1699f2c5d4d68480824e20e269 SHA-256: 5a3f93aec87e74924b5aa9c4856506e552c05771288a0c9e8d1739596ed0dc69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=i+want+to+play+a+drawing+game
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/49449392535.pdf
    • http://yongchengtech.com/uploads/files/202109121053449918.pdf
    • http://satcomlink.com/userData/board/file/memotupuzedaweruso.pdf
    • https://a-metal.e-giant.net/archive/file/files/17722247174.pdf
    • https://alansglobalservices.com/ckfinder/userfiles/files/44121578425.pdf
    • http://awfiowv.love-mrt.com/upload/files/bazosefafunimiza.pdf
    • http://siltherm.com/ckfinder/userfiles/files/jajirizureruf.pdf
    • http://vrakskodamnetice.cz/file/maxoxagegemaf.pdf
    • https://adtw1.com/ckfinder/userfiles/files/51179981602.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/549e4710d98437fd56f727b4af2c7ca3/xisafa.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/pikuxopanawotizifexufafox.pdf
    • https://alperbehang.nl/userfiles/file/29764606882.pdf
    • http://seowonbattery.com/files/fckeditor/file/81303170761363329d9b99.pdf
    • http://isleford.com/filespath/files/20210909045135.pdf
    • http://hyeminshop.com/DATA/files/75643236897.pdf
    • https://rotterdampools.com/contents/files/zesasu.pdf
    • https://mccartha-cobb.com/userfiles/files/69143064880.pdf
    • https://calienglish.com/ckfinder/images_store/files/30375702765.pdf
    • https://suksesunited.com/contents/files/musanopigunizazil.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614261c92f5ee---66730068759.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/95464693617.pdf
    • https://drjou-vc.com/upload/files/gibeseviwizejeki.pdf
    • http://beming.com/ressource/site-image/files/16747031010.pdf
    • http://theaterbuehne-schwandorf.de/userfiles/file/tisavu.pdf
    • https://bimstudioinc.com/media/files/kanikexejexodoxob.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a63.bin
da3bef414712e67e750ea414eea56713d79399c8821c08a483e947b0f1bf744b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 10716 bytes
font_01_sfnt_off000142c9.bin
968f558aad72320990856852a2c0e79ddcd57d3dddea903aaf87be07bff02d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142C9 18772 bytes
font_02_sfnt_off00017432.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17432 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.