Malicious PDF — malware analysis report

Static analysis result for SHA-256 587cf32480bf500f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-24 01:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7802bed67da9c21f33813a98513dc7ab SHA-1: 2bafa014babce6e5f41d579c5720068b7973e3c0 SHA-256: 587cf32480bf500fb4c6791a1e6d59d452cf0be64d2fa39a4e30b71a9bae5524
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://floridahouselottery.com/test/userfiles/file/67933159121.pdf
    • https://biroestarsa.hu/uploads/file/74647003856.pdf
    • https://ph2020.org/ckfinder/userfiles/files/tatotogedixawemoz.pdf
    • http://pijntherapie.be/uploads/files/34139033665.pdf
    • http://win-sonic.com/ck_imgs/files/bodesukige.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913202045127397.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210920/0946345256.pdf
    • http://aceonlinementors.com/userfiles/file/54650349754.pdf
    • https://reparation-mobile.net/userfiles/file/sajef.pdf
    • http://korean-school.hu/hangul/userfiles/file/gumumefadisugafavekoji.pdf
    • http://technology-mp.it/userfiles/files/liwegigo.pdf
    • http://lobanowscy.pl/userfiles/file/22598996431.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424ed093ec5---nukinipe.pdf
    • http://szcftz.com/upload/10600216993.pdf
    • http://anticacarsulaeborzoi.eu/userfiles/files/kitapizusotubotuzepasomuk.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/xasexadajodokexagebelunoz.pdf
    • https://radio-clipa.ro/userfiles/file/vufakefimefuzusosigubiva.pdf
    • http://www.siposferenc.hu/html/tomazedex.pdf
    • https://kuzeyilac.com/resimler/files/37119299526.pdf
    • https://fentesmakina.com/paket/upload/files/19837643619.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g4jclgr8nnb0bam1dlsatmk6i6/31757732898.pdf
    • http://lesen-und-schenken.de/userfiles/files/95664525315.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/18625422084.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=xcloud+on+firestick
    • 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_off0000d3d0.bin
a30445f866d14ecad299c9a47e2fd01c85a2ef0bfedebc861d0a512c6eb1361d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 18176 bytes
font_01_sfnt_off0001030f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 16792 bytes
font_02_sfnt_off00011b26.bin
4a1ae453245ee39b01b4f7eeabf643c749f20b827fefb9155c64ba0996bf8261		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 10508 bytes

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