Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe8b8d75a316424…

MALICIOUS

PDF

83.8 KB Created: 2021-02-28 08:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c0d37d3a2b7c0eb99f78d578969b72d0 SHA-1: 4195c2cd027bd7c1ad99c8e0fd107c6e635c1f3c SHA-256: fbe8b8d75a316424f665576e38e3452d3f244805434e566747166d74d9de4a91
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'trig functions derivatives sample', likely intended to trick users into visiting the malicious site.

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/wb?keyword=trig%20functions%20derivatives%20sample PDF link annotation
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/pojikavasuwokofamaf.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/baluni_classes_online_form.pdfIn PDF document text
    • http://wipababotuzuke.iblogger.org/palintest_pooltest_25_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_600ae771e26d6.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/c381c160d66.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/panixipumigi.pdfIn PDF document text
    • http://losmopaka.site/zoxapovomesawoniguvafa4aox7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxumodud.epizy.com/adobe_premiere_pro_freeze_last_frame.pdfIn PDF document text
    • http://ropobowex.epizy.com/acura_tlx_2018_manual_transmission.pdfIn PDF document text
    • http://jedigosegukigif.rf.gd/internal_quality_audit_checklist_template.pdfIn PDF document text
    • http://rixexovujawuvow.rf.gd/marvel_movies_in_order_to_watch.pdfIn PDF document text
    • http://sakigekoxigukil.epizy.com/false_cognates_worksheet.pdfIn PDF document text
    • http://jogebelofes.epizy.com/cuisinart_griddler_deluxe_manual.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_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 5484 bytes
SHA-256: 16976de1579e667c97055ae3d87e43db2ea4e295f7719461733dce5b455c1e90
font_01_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 11320 bytes
SHA-256: 2b3082dd38ded80a84f2f623e883ce2323479e3c03512bd843cbe7fe07272528

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