Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acd738f2d352a89…

MALICIOUS

PDF

79.9 KB Created: 2021-05-30 13:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0888acbc466038cc0a0fb34c917d5da5 SHA-1: 9558553cc26e9a9707f36aec0c516684e1224e73 SHA-256: 4acd738f2d352a89fe1ec19da0b4267819bcc1fb727f44f1dcd48c19a73c38a9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, https://pelibifir.ru/strik?utm_term=libro+demasiado+amor+sara+sefchovich+pdf, is likely used to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=libro+demasiado+amor+sara+sefchovich+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4368481/normal_60aff399d722f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379219/normal_5ffcbd559d7a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_5fea30e1ba2a4.pdfIn PDF document text
    • https://zimatesuti.weebly.com/uploads/1/3/0/8/130873828/824535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464995/normal_603123a3a6732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490265/normal_6023848013d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460048/normal_606c5769a084c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_6065a648cde34.pdfIn PDF document text
    • https://felepakupanemof.weebly.com/uploads/1/3/4/4/134473623/ef3608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_601a82dfb79a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6045127fc4105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_6031e10e2ff5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_6052d6da07d3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5ffd2b596d918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_5fd7c00d72815.pdfIn PDF document text
    • https://losujawidejope.weebly.com/uploads/1/3/4/3/134310111/datopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_6060c54d3efc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5fc7fedc724b8.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/64f96c5a-6ebd-45df-8f2e-b8679ec87362/wokojixuvizeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73609da-35dd-47ab-a440-848cb039896b/guitar_music_theory_books_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb04af1-72c6-4a74-bb15-c8e9de2ce0eb/bebumiweb.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_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 5504 bytes
SHA-256: 1dbbfee545ec5bfa9761c7ecdf788d956de0184a9e3d2037fead2f2b71e1b4d9
font_01_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 11808 bytes
SHA-256: cdef6e90609232d7156f9735d46a5c8c420e50fcc85be1b995eb92c47e30816d

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