Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9343949f43c86d2…

MALICIOUS

PDF

150.1 KB Created: 2021-09-17 03:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e9c0f15c91df692b0b8f2a1177da24d SHA-1: 443d0909e4a396a92ede73b4af67e81d5d169f4e SHA-256: f9343949f43c86d24dc679befdee6aaa5c7f1dc67d91384474185270e60c9eb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm used to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=quantum+mechanics+a+modern+development+pdf PDF link annotation
    • https://hongdung.vn/ckeditor/images/files/rekozuf.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/vexowosagakovugipu.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/90056115002.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/73071085594.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/binuratibilulujebake.pdfIn PDF document text
    • https://digireg.ch/upload/jufafisiralutudekex.pdfIn PDF document text
    • https://lecachet.fr/docs/files/sufenode.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/xiwasisosunitezejuz.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210909_A2ECE666DB746397.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202192124824032.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/kexokagirojudu.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/72517233312.pdfIn PDF document text
    • http://belloverde.net/emailer/file/39063633318.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/fetikugukerawi.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/51730502040.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/94634470093.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/fufasusosileseduxivarejap.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/33334310176.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/favusareviwiwosaju.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136a947c5ae0---pamoruriri.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/73167846228.pdfIn PDF document text
    • 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_off0001ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DED2 22264 bytes
SHA-256: 320885a2662bdc69f7c8c7d7bacca85a159622e00c8d06f048762e55a244782f
font_01_sfnt_off00021897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21897 11112 bytes
SHA-256: 8f631a77d513cdf7fecf80edf6afa4b889cd6d7f96da6e6a35af518a122e54d5
font_02_sfnt_off00023268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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