Malicious PDF — malware analysis report

Static analysis result for SHA-256 358ec3ea378f9993…

MALICIOUS

PDF

79.2 KB Created: 2021-03-31 13:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dcf6045800a90a664ead782ebbba852b SHA-1: e81cd76d508d947dd26497baf39a6e02ddd3f3a3 SHA-256: 358ec3ea378f9993c49bac9b78f19b1e2d896777676d4a8af3d4d8e1c4086b7d
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 0.9993

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://ponafet.ru/award?keyword=simple+english+sentences+pdf PDF link annotation
    • http://cg-designer.xyz/kuta_software_multiplying_radical_expressions_with_work1g7ar.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/how_to_transfer_decals_to_glass6z6bs.pdfIn PDF document text
    • http://twirlini.com/5671792242gytcj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_605124268d4ad.pdfIn PDF document text
    • http://obmenkalnr.online/zowamavijomiuy2iv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5fe0e28cbebc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415081/normal_5fc8e5e9b42cb.pdfIn PDF document text
    • http://fabulouss.space/mofeduxazomitaruguxea4f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_602ed6a679a87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/spring_cloud_data_flow_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/my_3ds_emulator_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/17834195467.pdfIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_a58dfc5358ce427b8493391fa583ce61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/vipogefipogodejuwezosuk.pdfIn PDF document text
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_f4e0c8c25ffd46daa7d30811e624633c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ca9a8f2-9692-4351-95e2-6207e3fa301a/51576371587.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/how_to_overcome_depression_at_university.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/aosp_android_9._0_pie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89132740-372c-41b2-be7f-3180ad8d604d/novivasamupixolid.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_b98561b1a9174985bf6fbf9a11a2c013.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/kuhn_5001_tedder_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/nautical_almanac_2017.pdfIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_188a226b9ed64c2eaca9a4bebaa69c27.pdf?index=trueIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_1f499cd4a494465d82cb0d5c3ab195f6.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_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 5364 bytes
SHA-256: c5731c31b619b92b92945758ed6ddf3fd7701ce093709c6985280c9029d3280d
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 10836 bytes
SHA-256: d8dba0b6f933a46ed197e2c640cd7428ed7e684284d0e74956784da29e0d31bd

Open this report in the interactive analyzer, or submit your own file for analysis.