Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c475d16859dea8…

MALICIOUS

PDF

69.0 KB Created: 2021-03-23 06:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00530a6613c0a55c66219df7159bd856 SHA-1: e2f2344a9eed7f08902de54bd571c56dfa796910 SHA-256: 67c475d16859dea8f56168a430c810c230c0b9e71907ca49576897e95ec17e0c
126 Risk Score

Malware Insights

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

The PDF document, disguised as an algebra worksheet, contains numerous embedded URLs pointing to disposable hosting and potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm characteristics further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://mezovuduw.ru/wix?keyword=algebra+substitution+worksheet+with+answers PDF link annotation
    • http://jisuvakuwiraza.medianewsonline.com/64639252368.pdfIn PDF document text
    • http://tujemet.scienceontheweb.net/76885186886.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/moravian_workbench.pdfIn PDF document text
    • http://xodokevazijif.22web.org/bradshaw_paintings_information.pdfIn PDF document text
    • http://rusherx.studio/pesabexuxigepakitizkfh.pdfIn PDF document text
    • http://trelon.fun/zaxazkc0qg.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/176962874343bd9e.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/how_to_reference_online_journal_articles_in_apa_format.pdfIn PDF document text
    • http://fanegasubi.iblogger.org/vubepatutiwep.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/589a2a62a6.pdfIn PDF document text
    • https://povurumupun.weebly.com/uploads/1/3/4/8/134884194/9db404bf588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_26f4e06a5690416a83daf8d5ef6e96bf.pdf?index=trueIn PDF document text
    • http://fofilelajisemap.rf.gd/xamimopikapopegevixu.pdfIn PDF document text
    • https://109d6476-c6f4-4eee-b84c-907698fb4207.filesusr.com/ugd/0d7ebf_44076221c6bd447f844dcd820c6e2dde.pdf?index=trueIn PDF document text
    • http://turekepopede.rf.gd/dazowi.pdfIn PDF document text
    • http://zugosixefi.epizy.com/firehouse_subs_shreveport_menu_prices.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 5232 bytes
SHA-256: 30a656ecd208880910a4fdc74b540736fcc43e035e6b54f43444f2fdb274accf
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10252 bytes
SHA-256: ac5c50865b65fee60750c440e9d4704536714a11a391defb013fb2fd83a087d9

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