Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79786b292e10161…

MALICIOUS

PDF

77.1 KB Created: 2021-05-10 16:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5aa3a5db09d9bfd9b8c10b4244d64a1e SHA-1: caddc142b8a61e3cbc22c6d3cf349e975e09a271 SHA-256: b79786b292e10161b22eb9a08d43f28bd29565e5a6b9e7922f6c17616c1ddd30
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://mezovuduw.ru/strik?utm_term=7+wisdom+books+of+the+bible+in+order, which is likely used to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=7+wisdom+books+of+the+bible+in+order PDF link annotation
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/2345731.pdfIn PDF document text
    • http://fresh-ita.fun/57394259550u28gm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_604fdf7dea879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417212/normal_6067a3229453d.pdfIn PDF document text
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/tulaluzela_gosanudug_rutup_xulebolotofok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fdefdd661895.pdfIn PDF document text
    • http://brumbum2.xyz/v_live_broadcasting_app_for_pclmcxo.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/8711f78e-5abc-404a-80bc-424904250b14/bafojipobalalezun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db1f8d3-4109-47de-8fd0-5c38ba66705b/40898532797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f3fba02-33d6-49f6-8ca7-3792827a950f/fojugotatezatimubo.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_7ea094dcccbe4c3fbb64b40114a87374.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_2ead9dd64ca341838c964e88ebcfad77.pdf?index=trueIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_7a7b65a8cfdc43a29f0ce39473f1f8ba.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_f54606097bc34688af327cb858b1df0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42724f78-b70a-4c2d-8d80-ea71dc5d2abd/arachnid_650_vs_800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d214636-05a6-4187-8f52-d3356cb6cab4/how_to_be_someones_1_best_friend_on_snapchat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168aae0b-352f-49e2-829d-ff68178f8469/propresenter_7_download_free.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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5220 bytes
SHA-256: 507475b05aa5028342a7657b30e13e355f696e9b023629827699266c8da6e646
font_01_sfnt_off00010306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10306 10680 bytes
SHA-256: f43fb5a5490cddc9f75b62c32bb9dda5ea5d81d5ab80a5034ff61cd8369c00c1

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