Malicious PDF — malware analysis report

Static analysis result for SHA-256 721c15f6b43774d8…

MALICIOUS

PDF

87.7 KB Created: 2021-03-20 15:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b7c42a9c7065422971a8fa0266b18550 SHA-1: 8c73fd323f9e2a7d2ef5fde98926a97690848803 SHA-256: 721c15f6b43774d80e6d741e271bdcb429f252e4a47c3c633b4f6d0381308222
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or scam campaign, leveraging a "league patch" lure to direct users to multiple external websites. The heuristic firings indicate a significant link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/strik?utm_term=league+patch+9.22+date PDF link annotation
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/kodebasikozuza.pdfIn PDF document text
    • https://lupamotikodoja.weebly.com/uploads/1/3/1/4/131406453/dazoranekinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5ff7f1fb36bd5.pdfIn PDF document text
    • http://tramlaweq.online/bomusetuwazes2yx4k.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/9881340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446774/normal_60060ed24d87a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5fe6b098d4d67.pdfIn PDF document text
    • https://kakadolaronenun.weebly.com/uploads/1/3/3/9/133997154/91589772ed315cf.pdfIn PDF document text
    • http://sluzhba1.net/87360776843s6pds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462976/normal_6026e412d38a4.pdfIn PDF document text
    • http://axecheat5.xyz/mulovuresuxididhi53e.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/moen_kitchen_faucet_repair_kitmlaod.pdfIn PDF document text
    • https://wexubowepupewaw.weebly.com/uploads/1/3/1/8/131856394/10ce83e502.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/nudokolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_3cec802d8a9448dbb2b50e580cdab52b.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_7948def8adc946c6a5f772dccbe6a769.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_340092364e91468885aede2b1d43df35.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_06a68c5a24264fcd92156eb87f25298e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 3080 bytes
SHA-256: 8574919c7c8a9f024103958ce015253c5a24b8e646cdb5f787658918713f2b2b
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 5288 bytes
SHA-256: c2045100edbb9a25feb40f3d4d2f38da1868e6cf2fed0ff6bffe83c8a71fd2a7
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 11136 bytes
SHA-256: 7bbac7910e906b72393426408dde093216328a64bf7418b5150bcb0bdf8ef1dc

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