Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a6ab16709aba43…

MALICIOUS

PDF

70.6 KB Created: 2021-05-11 11:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8128d61d88caa3c2d695d3985d6080a0 SHA-1: e531d446ceb2e9918cef273ac805be9253ac87d1 SHA-256: b5a6ab16709aba437e56a03cde31cbbf67795f5e67d560f308ca0717fdcd36b8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to manipulate search results or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=elementary+korean+insun+lee In PDF document text
    • https://gotizede.weebly.com/uploads/1/3/2/6/132695714/jovigipavoxe-gudiwotabit-xevise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_606dd40dbbe05.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/vogafarune-zufoto.pdfIn PDF document text
    • https://kanapikimafu.weebly.com/uploads/1/3/3/9/133997195/587bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_606cae64a9e18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_60385328472d6.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/zaduwusexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_600bcfab532bc.pdfIn PDF document text
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/a4dae1ba67ccd.pdfIn PDF document text
    • https://xuvuvigaxopezut.weebly.com/uploads/1/3/4/7/134721928/xemugap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_6000424881485.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/9756815.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/nulujidisefubifij.pdfIn PDF document text
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/fitiropimapamas.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/delis.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/zasepo/vevopef.pdfIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_1fec3f5f8623497ca69bb05f2f10629f.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_077cb6f39faf4a039be8eb63f5489e36.pdf?index=trueIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_ec14e0d4e4b247d6b1d3e2ffa7485880.pdf?index=trueIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_e80ac6f5a3b24176b8475319dfbb5b53.pdf?index=trueIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_52b18c1e1412414289a0969cf0ceb787.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/matux.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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 4952 bytes
SHA-256: 1ea4200fd1efe05433ee60f59bbabe3cb6babff98289e608f6013f54d94a4a7a
font_01_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 10464 bytes
SHA-256: b1ceb83ce582abf0245ccea51d2598f1ce3b8f50412c044068f4f8b4705fb533