Malicious PDF — malware analysis report

Static analysis result for SHA-256 18db7f3d0555e698…

MALICIOUS

PDF

81.3 KB Created: 2021-03-14 11:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ce5d4de67d23160e753aecdeb800a668 SHA-1: 0a77975a33b031a6b956e7f8c2841280fa9339c7 SHA-256: 18db7f3d0555e6987aaee146d39bc489263897904ec1e3a07604a3cee969e4ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm' likely intended for SEO manipulation or to distribute further payloads. The primary malicious URL identified is https://botokaw.ru/award?keyword=critical+characteristics+of+information+security+pdf. While no scripts were extracted, the PDF structure and extensive linking suggest an attempt to exploit users or search engines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=critical+characteristics+of+information+security+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fff6f739a750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_5fe8c3e02a94e.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/jujadodedaruxix/19053139683.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/xigevonijifove.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_62fae0c6e7e5470c82c410248f8bc9b5.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_b237a1454a28438f8ac9933747948ede.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/6284208546.pdfIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_fff1c1beb81847c1a3e9ec42fbe96486.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/role_of_ribosomes_in_peptide_bond_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/65010003691.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/thomas_aquinas_natural_law.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/31819179516.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_3168e1213da746f6adc6c81d5d93c9a3.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_70e5d2d88715401fbd1013909cbae48c.pdf?index=trueIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_de1d4bad148e432fa8c14cb1c67856d1.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_80d445a32821400eb0f1714b025967ef.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_ed538782fa86403abaa29a9d38eb2c14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/gold_glitter_butterfly_keyboard.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_f16877e43d1646c4b9b888ce677a5721.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_6c19bc0bfcca4ca1a58574cb8af0e72a.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_ab7f0e331bae43ffa2e410a196ba7d1b.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_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 5404 bytes
SHA-256: 82791e5c6ac7dc3546221c91e1b97d96c2ddfb9b3c4e57e0a0a131cefd39ae6a
font_01_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 11040 bytes
SHA-256: d8dcbf7b3ec1d8d7f9b223c8e04a23a6ecd173ed46eef1558e4a68ff8fa60b3e

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