Malicious PDF — malware analysis report

Static analysis result for SHA-256 25136b3263fabec6…

MALICIOUS

PDF

106.6 KB Created: 2021-03-14 19:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 807ad6ac0815202da1298bc0cedba2ce SHA-1: 2389c2d1a0f48cf18954d6008b1b9a7d55d3a2b1 SHA-256: 25136b3263fabec66a570d8fa9b4b1f8f69b3e9163a3c1fb9b8e37b5ce10e1f7
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm with external URIs, specifically pointing to a URL that appears to be a lure for a digital marketing agreement. The presence of numerous PDF links, many of which are benign, suggests an attempt to obscure the malicious intent. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=digital+marketing+agreement+template+doc
    • https://cdn-cms.f-static.net/uploads/4387701/normal_60327fb2b2515.pdf
    • http://gosoxegekiri.mywebcommunity.org/is_international_mail_coming_to_canada.pdf
    • https://static.s123-cdn-static.com/uploads/4481527/normal_5fc9f7f41d227.pdf
    • https://kulufitobapesad.weebly.com/uploads/1/3/4/4/134443603/pajumumifilisimiwede.pdf
    • https://cdn-cms.f-static.net/uploads/4452373/normal_60420799ac544.pdf
    • http://jakesubinosol.scienceontheweb.net/buwibomomar.pdf
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/9425682.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/54e7d35c-6e10-47f7-9336-ea5640dd76b8/what_is_verbal_communication_explain_its_types.pdf
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_e14e9cf060364a5bb30432e6a1498bc4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08bc1315-65a6-4f16-aa56-b0cee75e34be/nosajutage.pdf
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_0effe3028a9042d89007f5a15488a76f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/360ac235-013d-4147-880b-f5a1469a259f/how_to_set_up_charter_remote_to_haier_tv.pdf
    • https://uploads.strikinglycdn.com/files/12d58096-e5ad-4291-bfe6-299606ced065/will_there_be_a_sequel_to_captain_underpants.pdf
    • http://voferumupisefag.rf.gd/33541361515.pdf
    • http://furofazitogo.epizy.com/25290057759.pdf
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_45cc9f9b9ff94252972deb6350e6b2c3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87af3016-b53d-4f9d-bd23-4e9ca0a13406/zuzowipugabagadobolo.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f97.bin
127d26796faa685e2075a3d4e76352c9a8a4f76cacc3ce8ec29f2ad9609b2fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F97 5276 bytes
font_01_sfnt_off0001617d.bin
1c56b2a37e5896e100d872a7602796115fcc7a07ac64d440be22a9775c1fabf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1617D 10996 bytes
font_02_sfnt_off00018751.bin
4189bb5d82d37c3b06c761c00ca3b3c8a7a7312639514cd6a20481e76712d457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18751 16388 bytes

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