Malicious PDF — malware analysis report

Static analysis result for SHA-256 1930c42d465927f1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 19:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6d910adb0b5a2d3b6f6233ec9119993 SHA-1: 5af171b37c757f0f0fa66983ba00b45208ed013b SHA-256: 1930c42d465927f13b046cb1595a1351344d46a94fcdefca1fb0e136412eb6e9
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the PDF is designed to host many links on disposable domains. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://driscollandgibson.com/images/edit_images/file/29264521604.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/40183260053.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/74872066583.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/48991257184.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///xitokagazonopotetibu.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210901020513.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/gugapunebibipirovuxokobe.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/4935352003.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tarirakotexirigaz.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/mapeximagafa.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/87257231603.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/94047503266.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/feligizaxaxali.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161314deb54867---janugudalam.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/guravafojeponagone.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dulasopeborupotodeselu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/zematikerorolifaliduzovo.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/supekuwexitasikajemile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=coc+hack+version+download+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_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 10752 bytes
SHA-256: c02602bc495a302b0dc6ad1ad4ce4937e3efc48f4cc6a5ba9bc6909b79cd675c
font_01_sfnt_off0000ca37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA37 16868 bytes
SHA-256: 17e18d468a88b286cf4923f86b193e82a5fd8a705f98916e04b78cfe821068b4
font_02_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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