Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c724a6a45ed35b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-28 21:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db0050d9e08ad7319427ea2dc680e4e1 SHA-1: 97e9a5630959aabbc5be23d6031b1e6f2e3e4cb1 SHA-256: 38c724a6a45ed35b5b263e45cfc6caf0a2a0e2afcf7b60d4ece0cf2927ccf5c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the presence of external URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=exercise+lower+back+pain+pdf
    • https://static.s123-cdn-static.com/uploads/4489733/normal_5ff288f12f14a.pdf
    • https://jekosupoma.weebly.com/uploads/1/3/1/6/131637113/2796ec12b2393.pdf
    • https://static.s123-cdn-static.com/uploads/4368745/normal_5ff268fdaf954.pdf
    • https://static.s123-cdn-static.com/uploads/4366374/normal_600820a4769ba.pdf
    • https://kujivapepomo.weebly.com/uploads/1/3/4/5/134591142/jisifezez.pdf
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6033fb07db769.pdf
    • https://lalevajapogos.weebly.com/uploads/1/3/0/8/130874146/mireguf.pdf
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/juferezebuwudu.pdf
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/8600766.pdf
    • https://static.s123-cdn-static.com/uploads/4500201/normal_5ff0bef33ca03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/minaxigevani/how_to_program_overhead_door_legacy.pdf
    • https://uploads.strikinglycdn.com/files/8c26aedc-01a1-47a8-92e9-46fa272501b0/bodibel.pdf
    • https://uploads.strikinglycdn.com/files/0d5ddd11-02b5-4873-a465-62e04acb6e0f/excel_vba_get_range_selected_cells.pdf
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_dd7a0a936fb44ae4b258ab7f0cb6e351.pdf?index=true
    • https://s3.amazonaws.com/jupoti/gogidaduzetaxelaxaxoz.pdf
    • https://s3.amazonaws.com/wupagivoz/66054704103.pdf
    • https://s3.amazonaws.com/zodawanuror/swords_of_ditto_beginners_guide.pdf
    • https://s3.amazonaws.com/wivunonovef/whats_automatic_processing.pdf
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_8e45e568d6a449be8699c727407362d2.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/x
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb9.bin
34d13825cddb12ebadb803215c03bea9b6d16e3a9a94a8b441052de74d4f8be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 5472 bytes
font_01_sfnt_off0001107f.bin
33f0ba3aff5147745c2a312f5ad751134866c479fcf5986875881ed7994725da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 10944 bytes

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