Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20dbc244bc6213e…

MALICIOUS

PDF

72.2 KB Created: 2021-03-12 17:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 16d54efcb9891840cd1c1e43689006c4 SHA-1: 5d43b557cbe117e6973d8c71da1af8c35919a69f SHA-256: f20dbc244bc6213e7eac685a870ce33bbb61bc330436beffc5e0283349a4a572
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 0.9998

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://gimoguvi.ru/wix?keyword=maslow+hierarchy+of+needs+worksheet+pdf PDF link annotation
    • http://kikaxefe.22web.org/31931790758.pdfIn PDF document text
    • http://klosheff.xyz/reaper_miniatures_kickstarter_2019ptv81.pdfIn PDF document text
    • http://knitfqph.site/full_wave_rectifier_circuit_simulationik5e7.pdfIn PDF document text
    • http://carishr.com/angular_define_array_in_templaterie5z.pdfIn PDF document text
    • http://kesogapebenem.iblogger.org/bihar_si_old_paper.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/viwoxuz/75759472631.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/12795367996.pdfIn PDF document text
    • https://c9ecad83-e70d-4e71-84d8-0086c45344aa.filesusr.com/ugd/01a317_6e9d41311f4b4500900f4b50ee99186c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/poetic_edda_vs_prose_edda.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_1bad67a4eeb94a72b5207987c85651e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5435f83e-6a3d-44d7-9b1d-6ed6a7a84a13/58289973200.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/wixofawososawivopugoxap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c0187c-3a46-4f40-b881-6a4914de032d/93000570005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cec0f30-75f1-4d11-bf96-859a49b072e1/kinubuzikew.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/seporimefovutar.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/dish_network_guide_not_updating.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/kotuxuzozalukav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90108167-77a7-4aff-9123-e9fa8a69a100/what_size_snowsuit_for_baby.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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 5508 bytes
SHA-256: ca1c9c54d31273479da1620b02a3c98d2edc38c3a044ab785044d152f7a3e8e6
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 10208 bytes
SHA-256: 9d56761ed9cad451ed60da4424b8f4dc234d25e26f5e6c433806cd734e5040d6

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