Malicious PDF — malware analysis report

Static analysis result for SHA-256 66232031f04f2719…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 22:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1c23dff34185f738af62401e03487b7 SHA-1: 701d8fa21327d66aa623a4237d553913669604e5 SHA-256: 66232031f04f27197867bf50d7bbc374e6716b78d56d690f25d5c88bc5c21f45
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, potentially for SEO manipulation or to distribute further malicious content. The embedded URLs point to various PDF files hosted on potentially disposable domains, reinforcing the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://rrarental.org/upload/file/sigutumus.pdf In PDF document text
    • http://aelma.com/sites/default/userfiles/file/pikup.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/firumanuwefopupases.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/zufuzibuvulolobi.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/xaruz.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/85221326173.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/nubuvopifezukojofex.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/87120614753.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/rebokilepimakuv.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109051028583365.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/4907596916.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/64390142842.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea6a287d9---jidumarisipebejorepegutos.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demumavolunabolibe.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/8467515298.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/71062838517.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/41257197433.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/mavaru.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/rutoravuziwokevopa.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/87658574688.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/37008927622.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/rutotekitavebujigize.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/18657629337.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/94894585474.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/sowepapugagadimegutub.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/63295275318.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/gifujasetulu.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/1165131653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=iphone+emoji+keyboard+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 10880 bytes
SHA-256: 06cb2831afb69f5f74649acde273ccc6fc122775e78674e4b47649c6fb9ab76d
font_02_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 16556 bytes
SHA-256: 14711c91b824a26758a920aa2338fd9c60dc89116b9c2a37d964ef2db19dadaa