Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d8d82f0cd9f589…

MALICIOUS

PDF

73.7 KB Created: 2021-05-31 03:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1c7b45ca44d58bbcfc7e7411d580ace6 SHA-1: 72e9accbf7d5b28c61fc855ee74bddae2cf2530a SHA-256: 38d8d82f0cd9f5893940f042cdb452abecab9a5e61b2cf5d3504e730e2612cca
204 Risk Score

Malware Insights

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

The PDF contains a lure for downloading a game, indicated by the document body and the presence of external links. The heuristic 'PDF_SEO_LINK_FARM' and the large number of extracted URLs suggest a link farm or phishing attempt. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing document or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/strik?utm_term=wwe+2k20+apk+download+for+android+ppsspp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fd7d2b3d6177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_603f8dad36b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_60112918a1d71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6049455832f5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fdc546315ddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5fed6a6c1aff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366351/normal_5fc844db0d2be.pdfIn PDF document text
    • https://wimixexaselu.weebly.com/uploads/1/3/4/3/134324609/1345465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486045/normal_5fe33e20f2b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463010/normal_603c7d756fa48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_5fe663570d7f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_60025781973df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fc682b248886.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/7a536afd5c8c.pdfIn PDF document text
    • https://tenaxolisus.weebly.com/uploads/1/3/4/6/134654195/5024214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_6002b05346c80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5ffbe61494059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422377/normal_5ff2fec18ffb9.pdfIn PDF document text
    • https://sofubile.weebly.com/uploads/1/3/4/3/134380394/verejogejux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/969112c6-ab02-4c3d-bd4b-e7e0c10b199a/zogelarasufijebefosanexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ded95c3-11a1-4798-8baa-8b1dc277cb18/32345000156.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97b9f09-0650-4ecb-8b96-18b15622c120/does_directv_universal_remote_work_with_genie.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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 5476 bytes
SHA-256: 06d19eb8908a92f9fa81f93a80d7f68b833014689b618aa35170b137a8bca597
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 10108 bytes
SHA-256: 5441a51717c81f52bf2e6717bdbbc5503c68e3252e8e83642491ceea1c980e98

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