Malicious PDF — malware analysis report

Static analysis result for SHA-256 14aa3d1a74467bbd…

MALICIOUS

PDF

71.2 KB Created: 2021-09-10 05:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75c5d5a90331af36c6ee9ca71ac0c21b SHA-1: 487824d8b1a293a2a06df9d93954c59a3bf90d53 SHA-256: 14aa3d1a74467bbd2cfb3ced8b50e6b3b7f30743cefc16fd63e5cb8bf3c555a2
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that redirect to other PDF files hosted on various domains, many of which are of unknown reputation. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://cungcapbaoduongcuanhatban.com/upload/files/vedewoge.pdf
    • http://maskaevlawyer.ru/userfiles/file/15352388121.pdf
    • http://girisimcilikproje.com/resimler/files/8764916997.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109070422427178.pdf
    • https://lawyerupsmart.com/tempimg/file/84871692723.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/lobidugomopeguk.pdf
    • https://akilanews.com/ckfinder/userfiles/files/fiwudubarafuwewox.pdf
    • https://anninhsieuthi.online/upload/files/xovugiwexazi.pdf
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/jivenerevuxidunixaximufa.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/muwagogerikepovar.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/dijeturobufasov.pdf
    • http://abwingsbuffalo.com/uploads/files/radilejegiforudalur.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efdb499c75---nefodiwixixukam.pdf
    • https://akapacha.com/userfiles/file/77207182464.pdf
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/62914871222.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/tibatakifivir.pdf
    • http://sicilalluminio.it/userfiles/files/lopiwaxuz.pdf
    • http://www.jokilaaksonratsastajat.fi/file/xexutidefadedurarupub.pdf
    • http://t-eamplus.de/web/editor/files/bajusepafoxawuwupolebitow.pdf
    • http://phongkhamthienhoa.vn/images/files/2037467090.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/furixebojuweviluzata.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138975cab820---59489845720.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=new+ringtone+2021+malayalam
    • 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_off0000b372.bin
06306a1a24725bf4e38a9e26bbb42abc439ffb9ddd2c824f82170a3a1155714b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB372 16496 bytes
font_01_sfnt_off0000de75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16792 bytes
font_02_sfnt_off0000f68c.bin
963c7ade46655a82567d06fd165ffea1380e215914624e0fd18ced3f0127e8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10756 bytes

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