Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1f13e09cdbfe6b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 00:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c66398481c5a9642c9b01a258601e3c3 SHA-1: a67813a4367cc854be2a7a170848a7faa785b251 SHA-256: 2b1f13e09cdbfe6b191bdec1c6b8639833f03ec05c4112e05afab704ba4e4bb5
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by heuristics as a payment redirection lure, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing campaign designed to trick users into visiting malicious sites, likely for credential harvesting or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://queure.ru/uplcv?utm_term=hot+live+stream+app+apk
    • http://abwfinlay.com/uploads/files/nerina.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/39557760311.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614456e593912---41904191918.pdf
    • https://kolbandibileklik.com/resimler/files/25128570686.pdf
    • https://thietbivesinhanhhuy.com/asset/files/lozoputog.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/wikonijonixul.pdf
    • https://rubfila.in/files/file/47391969747.pdf
    • http://tutek.eu/userfiles/file/11657352259.pdf
    • https://sanmuabancongty.vn/images/content/files/53598873540.pdf
    • http://halanmilk.com/upload/files/28124432847.pdf
    • https://onthespothousing.com/userfiles/file/donowunegasapetotid.pdf
    • https://immsac.pe/sgi_userfiles/userfiles/files/xixamuvopefagadusol.pdf
    • http://khacvietlaser.vn/public/images_news/files/11149756836.pdf
    • https://indiansecuritisation.com/ckfinder/userfiles/files/saviwuwijusukotumetaden.pdf
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/kudekatoxujateb.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/nagoto.pdf
    • http://sukhonthip.com/file_media/file_image/file/39939448922.pdf
    • https://nacituran.com/userfiles/file/wowerun.pdf
    • http://thegioicamdo.com/upload/files/8128066152.pdf
    • http://badaranquehablar.com/userfiles/files/senepurezuwebiwem.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2585cec54---denovibozo.pdf
    • http://twfindia.in/userfiles/files/gigurirawaxubaserixinuvit.pdf
    • http://yildizteknikelektrik.net/resimler/files/xuvojerew.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/vezilozosidominasutuwem.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_off0000dd79.bin
86a631994f0cdc7c9a8a7a4ac278f08a3e9cc3470ce626c92d01862f13abfc08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 18696 bytes
font_01_sfnt_off00010d6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16792 bytes
font_02_sfnt_off00012583.bin
831deeff6fcf6d17904dd016755cde4291a89b0d3c9ad254d892974e12ff3ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 10456 bytes

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