Malicious PDF — malware analysis report

Static analysis result for SHA-256 11391d67f744889f…

MALICIOUS

PDF

77.8 KB Created: 2021-04-28 11:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c07e920a852ee158933bce27af56abe SHA-1: 5abdca5ea1097f5c0b4bf24bf623a41a063216b8 SHA-256: 11391d67f744889f5766bc6161dfcad08c209820220d9156ebf9ab63fe8961b8
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=tissot+t+race+touch+review
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/lizolerilifakiki.pdf
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/2fcb8d.pdf
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/nogakosepe-vigefu.pdf
    • http://dogopanasukodum.22web.org/lotajabalabixuvifelene.pdf
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/3511143.pdf
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/wefapuxot.pdf
    • https://cdn-cms.f-static.net/uploads/4412894/normal_60218543ec001.pdf
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fd5f634c678d.pdf
    • http://turekawetareju.iblogger.org/how_do_you_record_accrued_interest_income.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_96c139af29264deaaafbbfc88f372437.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9423bdc7-2366-454d-a6f8-3a158459c700/how_much_does_it_cost_to_repair_computer_screen.pdf
    • https://uploads.strikinglycdn.com/files/fe3fd1d9-0420-4486-9c07-ba795844e33d/kenmore_heavy_duty_70_series_washer_will_not_spin.pdf
    • https://uploads.strikinglycdn.com/files/66192377-6801-4c55-b883-cd379014ca89/gagikojonedazedogojam.pdf
    • https://uploads.strikinglycdn.com/files/21a3fda8-1694-4b57-9f84-55633606e8a8/85864317957.pdf
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_768a6514747b4ed39e627e371284b4d3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b3d48a81-f5c3-40d5-8738-192c3cfc8af3/14790000088.pdf
    • https://uploads.strikinglycdn.com/files/8a9338ed-a84e-49c7-b299-ad39f112e2f7/mclane_edger_blade.pdf
    • https://uploads.strikinglycdn.com/files/c92b6d2a-4807-4168-a465-0a9b6ea25a8f/what_places_give_free_food_for_birthday.pdf
    • https://uploads.strikinglycdn.com/files/32a0c0a7-8447-465a-b515-1722fdd768c0/nederadusivawipesetewetof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef3d.bin
b20e9bd5d0e051f48f02ab257da765a6280c027bc19f134a545de9f8778a43ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 4956 bytes
font_01_sfnt_off00010023.bin
ce1dae4b6d96a250522ee89db97567dd02a6fc1a7118dd0af14b296a3a764694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10023 12776 bytes

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