Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc81c1d659f8699…

MALICIOUS

PDF

73.6 KB Created: 2021-02-03 06:37:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: a8c19d91fe166c7c42830fc4cbf6edfa SHA-1: 4ca2c1e772f0d1d7843c02d51ddb332daef66226 SHA-256: 5fc81c1d659f86999aac070f40cb2657be7a606670527867981999126b50c095
236 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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
  • 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://jacksth.ru/wb?keyword=evernote%20premium%20apkpure PDF link annotation
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/7d0e8f2179b75.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hIgjX6E/gukufosijepisemuriporove.pdfIn PDF document text
    • https://cdn.sqhk.co/gotoruzud/idZRhbo/3489460389.pdfIn PDF document text
    • https://pagafika.weebly.com/uploads/1/3/5/3/135339488/cc6bbb9be5b5fa.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/hUyEghd/az_screen_recorder_app_free_download.pdfIn PDF document text
    • https://tujiniwiko.weebly.com/uploads/1/3/5/3/135350236/325337.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ffb144f19819.pdfIn PDF document text
    • https://jotafatebukuzeb.weebly.com/uploads/1/3/0/7/130776674/99609f0794bda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daniwodug/ccna_200-_125_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/78506179028.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/zusoxuvewexuxilozumageso.pdfIn PDF document text
    • http://gagonunanu.epizy.com/69396238419.pdfIn PDF document text
    • http://suvumudupese.epizy.com/16986543143.pdfIn PDF document text
    • http://vegexiwijije.rf.gd/gimokexaleb.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/tewemonosato.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_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 4836 bytes
SHA-256: 8bd64833f8ba85082ece1487bc06c45362ab2c830c707eb8f39bcb8fc5e1e958
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 10980 bytes
SHA-256: b9e331bd7ed7a0a6d8f8a00e8e352c4af1a36fd9b4bb40ce373f50fdbe718926

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