Malicious PDF — malware analysis report

Static analysis result for SHA-256 da06992b8e1262f7…

MALICIOUS

PDF

72.2 KB Created: 2021-03-22 11:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d680289a3536f612ee1db134ffe6c753 SHA-1: 336dbf329d282cbea65a9abe6406ce1224bb8ca3 SHA-256: da06992b8e1262f7fe20b153b75f0b7a865c516cd0c67c18bc343690a0ac30cb
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 as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/123?utm_term=mastering+metrics+pdf+chapter+4 PDF link annotation
    • https://badikixokatapi.weebly.com/uploads/1/3/0/7/130739740/c4ae2c9489f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5ffc6d59798e6.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/ghakgi9/project_management_jobs_columbus_ohio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479705/normal_5fda5873dfbc2.pdfIn PDF document text
    • https://cdn.sqhk.co/sirobuse/ietB0vw/assistant_principal_jobs_in_va.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_603b3b6e1d10a.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/2dc3ad6.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/ggC5ia9/musica_de_los_80_gratis_escuchar.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/nasujujak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_601a03ab6794b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_ba46196c9e874fa9a11d3a942d20df76.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_cb65de6e0a654a5da301b838b8a57a08.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_c89a3a488eeb42d19f3d095bb709befc.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_b8deb33499ab46bab73cc739378b743f.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_fa5a4337043548aabf1e100f35c780ea.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_90df8b5c67124758916407a67c97f679.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_1937acb662904c2cb0e1c7d4f109f6bc.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_9c51c2d7b1cb40c58ea4c0dc29c6afa8.pdf?index=trueIn 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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 5628 bytes
SHA-256: f63189071e290644e3d24ce33d5f2a4e42c7e63ebeba8851206de9637751e3e3
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 11496 bytes
SHA-256: f3d6fd1e2e50303aa7e408be92d4ba589b4dfb12ee67c3e557fc6789d87e8e62

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