Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc25b7a969b5aa1…

MALICIOUS

PDF

79.4 KB Created: 2021-03-12 15:01:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d4281423edb9a791113b4634232d256b SHA-1: 35f37d9bed14174888413c6726d961e8de6bb7f2 SHA-256: ecc25b7a969b5aa13283d5c2829c873b51c8c7c70002602b9ba007ce03b88bbf
156 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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=1984+reading+questions+part+3+ch+1-2+answers PDF link annotation
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/16c91fbbf892adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6047c87d3dd0d.pdfIn PDF document text
    • https://ladolijid.weebly.com/uploads/1/3/2/8/132816107/valikamukox_diposepajene_pipopibi_sufubitakuj.pdfIn PDF document text
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/waludejuvezi_tolazitupo.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/5048c9ee43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392864/normal_5fcbe1ce32cb6.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/cf4b2c75-b0fb-4f8f-96ce-f4e9c68daf77/51051155216.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/bandwidth_test_software_free.pdfIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_be3a8416736a4c488eee5980e8a82a55.pdf?index=trueIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_6780bee000bd4816b6112f5e16ef3b1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/janukajifezonopafum.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_92696e4dbffd4fbe8ec19fc958e84f92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df0a752-c982-46a5-a50a-b329132bd7d1/what_is_the_best_computer_for_university_students.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/dopimitojupam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cacaf61a-670e-4c7e-b2cb-eb5cac323526/what_does_the_lights_on_your_dashboard_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3db1e5-06bd-47b6-9ab3-2d2f35717196/briggs_and_stratton_6.5_hp_service_manual.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_0187238ae574446db409917b832261fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/nazofiguwadosefugodi.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_4601d5a82e554b93909695a0ea76021f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f031383-4e52-4e88-a2f6-d669355edbbc/call_me_by_your_name_free_online.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/25463565184.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_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 6244 bytes
SHA-256: 4e8f1ed6adaa27616e2c051cb0563ede4c0d87d680db38f456ea29dd42d54c33
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 10792 bytes
SHA-256: d853d09da4d2da8743658d03e1e814f0c6f42804df896c919522d7c8e34a58b4

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