Malicious PDF — malware analysis report

Static analysis result for SHA-256 2798598787605f57…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 20:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 179d0253c39b9d02463f032a8446dc13 SHA-1: 662368900342b00f1ad2b219ca4c060458fc02d5 SHA-256: 2798598787605f575bccb1b92618d0f59da9dd1e22c726f92fc4ca20c35793ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains or are part of link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cooperspick.com/files/nazubeworemaxojudepa.pdf In PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/35520629667.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zabimogodakekek.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/zanukanufatujeganokovavuj.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/direvenesutajemezuwosodiw.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/57901165861.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/kigabutefabaluv.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/76516812419.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210917_135949.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e867f2bd---39332783562.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/96200517108.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/kikuzilolipapub.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210914_5EEE83E8B6BA00F1.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/xetebisupolizizipugudo.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210912135130.pdfIn PDF document text
    • http://trivio.it/userfiles/files/dalejanujuzegeniposomepi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/tofolazadujuba.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/65222590451.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/kepufumorawotajom.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kusuvaramurosukasijije.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/fuluveveguwuzamurutav.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/sejanomoline.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/bijaxereboxofopebamit.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630961620704814794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+textview+set+height+wrap_content+programmaticallyPDF 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_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 11340 bytes
SHA-256: 81f8cc23bd74e7f588735dc78be283d44eab5b3d663a8b85d3f592ed10145625
font_01_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 17904 bytes
SHA-256: f0c74c85c9dbd407d38bae91e34109f6f9837ece38f5aeb8b7591db540ccd748
font_02_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1