Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22bce49025e210a…

MALICIOUS

PDF

115.5 KB Created: 2021-09-20 22:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4583fec04566159144cd26d1b37bddb SHA-1: 8e37bc36896a963321bfba85bd6327a1c1ed8b90 SHA-256: c22bce49025e210a5bcf869899f4999ab16b14c685b8bcf4e72c69ed49b45796
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tainandentist.com/uploads/files/202109022214275971.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/25039137206.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c5cb61eb---botisaromolitipule.pdf
    • https://soudurelauziere.ca/upload/editor/file/zuvaxufovolaruborimofowi.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/14886649385.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/62876665145.pdf
    • http://www.jindatunnel.com/up_files/file/lizivuxilemumos.pdf
    • http://wiskind.com/filespath/files/20210920111813.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/65302984892.pdf
    • http://ccsup.co.th/uploads/ckfinder/files/jesivizejibapovovadami.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/32375506958.pdf
    • http://dissanna.com/temp/fckeditor/file/95283605531.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/14777515388.pdf
    • http://techmechengineers.com/uploads/gujeze.pdf
    • https://strechybenesov.cz/content/baguripij.pdf
    • http://sangtaoad.com/uploads/userfiles/file/32810135257.pdf
    • http://eros-arena.name/eros/userfiles/file/vumexaduwaxix.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/kagisujodejonogutigezog.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-18/20210918170438308219.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/16470247983.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/tipopafetegu.pdf
    • http://insightonafrica.in/userfiles/file/wevixafibevajiwujuduvodiz.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210905_214342.pdf
    • http://ehoron21.mn/uploads/files/peterakewikemiguvazi.pdf
    • http://josquin-capella.de/download/mexoragafofadivufomus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=monster+hunter+android
    • 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_off0001598b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1598B 16792 bytes
font_01_sfnt_off000171a2.bin
f1ee04921deb2fd63e72783d07d33b5108bafbe8509b75963c4dbf0517feb192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171A2 10392 bytes
font_02_sfnt_off0001891b.bin
28c6b4c2878a4602589c9af5f5bedb7caa66300c468b5adf04a7e56c1520f8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1891B 21328 bytes

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