Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7fc82d4ad88f63…

MALICIOUS

PDF

78.5 KB Created: 2021-04-21 00:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bbb097b99aab29bdc772bb0423a1956 SHA-1: 72dbc9418e53b9b635c96514fcedbf97b83ee1eb SHA-256: 6c7fc82d4ad88f630689a18c297759ba81a3f6ead1e041155a8bd9788f90a2f4
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs supports this assessment. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lead the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=what+is+alliteration+and+give+example
    • https://cdn-cms.f-static.net/uploads/4419437/normal_6013a068b1f25.pdf
    • http://prizinsta365.website/48106483249poryb.pdf
    • http://study-english-05.site/57660307797ki70o.pdf
    • http://verifybadgesbusiness.com/restricted_stock_units_tax_reportingtyhhk.pdf
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/76ac43e1f1d.pdf
    • https://cdn-cms.f-static.net/uploads/4476939/normal_603773d2ae26e.pdf
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/3223170.pdf
    • http://cosmicgig.com/royal_london_governed_portfolio_7_factsheetfnylz.pdf
    • https://static.s123-cdn-static.com/uploads/4480589/normal_5fe2135772025.pdf
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/javesugulapijen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_03e514ba7c3640829c58d32297aae8ab.pdf?index=true
    • https://s3.amazonaws.com/purixifusipelid/japukidawofiw.pdf
    • https://s3.amazonaws.com/wolina/2005_nissan_pathfinder_car_seats.pdf
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_2df65ee82dc0439d8839df755737fb07.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_53bc091119d74dcdb33f384c42894b27.pdf?index=true
    • https://s3.amazonaws.com/padosumifubobo/naremunibapusuf.pdf
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_7ee3afff563441a0b9ce28e6cfa6a302.pdf?index=true
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_21dbecbcb1a84adeb1771459aad810c9.pdf?index=true
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_51942c2e817e46c1bac3082f2bc3f45b.pdf?index=true
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_62be5f5092984150ab305ccb7bd53984.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f81e.bin
8b2e88314aee8394f27170c7a7421e14b4bbdab84e7a908fb973d6432e8f93e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 5512 bytes
font_01_sfnt_off00010abf.bin
5658307b9f9072576b89166228d81442bb39be66cff6f4bc66388c3bf5a43c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 9868 bytes

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