Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ed302dc31ffa5d…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 14:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 23921f855a2be9aa1a0e96f7e8c05ebd SHA-1: 50510cd8ee52032cd11841b39810c756e779fb5b SHA-256: 81ed302dc31ffa5d83dbcedf3bb06e41c604952c66af2c1187bd4fe8e9ef5d22
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting, strongly suggests a phishing or link-farming attack. The ML classifier also indicated a high probability of maliciousness.

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://baarspo.ru/wix?keyword=zika+virus+in+mexico+playa+del+carmen PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5ff295d534830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451556/normal_60062c40a21ea.pdfIn PDF document text
    • http://davupopebuwiser.sportsontheweb.net/what_foods_to_avoid_for_coeliac_disease.pdfIn PDF document text
    • http://nuwikivetajed.iblogger.org/stihl_weed_eater_gas_tank.pdfIn PDF document text
    • https://bumesusibob.weebly.com/uploads/1/3/1/8/131857970/64c601c86c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_60140c77e3408.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/7136996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_600b2f827de32.pdfIn PDF document text
    • http://simkosa.website/61604983770er6if.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5fc6870d7d124.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/99350902755.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/negenuxovi.pdfIn PDF document text
    • https://netokuwusava.weebly.com/uploads/1/3/4/3/134384506/acef8262c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459625/normal_5fc87a6a27fd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_601efa91177c7.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/the_rivera_family_cast.pdfIn PDF document text
    • https://jotafatebukuzeb.weebly.com/uploads/1/3/0/7/130776674/suziroxakudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_602fe3cf42255.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potosalusuk.rf.gd/53452649861.pdfIn PDF document text
    • http://kababotatage.epizy.com/tezener.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_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 5472 bytes
SHA-256: 16535bf20ab6a8a0921e6090b82da437b9a22e47653308d377f34256a657dc20
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10284 bytes
SHA-256: 1f209a3b7cf7e99f0fb0a795ddebab70727884cd804d2bf3dff85aa47989d7fc

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