Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e3353f294a0082…

MALICIOUS

PDF

72.4 KB Created: 2021-05-08 09:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ea3c599a8bba0292d711691f6f3e128 SHA-1: 7ddbca23711bfa66b06cdc65b46eb82e0cf33a04 SHA-256: 99e3353f294a008244e7e77154852d7e4c799c12d8b11b53ebdb33b3fed0e72c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms or phishing campaigns. The primary URL, 'https://pelibifir.ru/strik?utm_term=vedic+astrology+books+for+beginners', suggests a lure to a website disguised as a resource, likely for malicious purposes. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high probability of malicious intent.

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://pelibifir.ru/strik?utm_term=vedic+astrology+books+for+beginners PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5fec5236ec9b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_6040e80ec40d7.pdfIn PDF document text
    • https://zapunetiregete.weebly.com/uploads/1/3/5/9/135956705/2998611.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/8919957.pdfIn PDF document text
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/fegawa_nuzoxomik_kedajalotat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_606864a2b4c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_604bca6aa6186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_6058e96be1434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_531d7cc1b81d48f3bdd66f29342a7507.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/ielts_academic_writing_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/pikug.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_928ffb30e44c48f79d71ccd5f1e081f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/rebitujudilowimos.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_269006e7850845b4842eea88263ab683.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/3d_max_tutorials_in_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/how_much_do_e_commerce_make.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_6e017c9dcaef40a28c5689d15f633710.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_3442e1a2d69449d7b9b6d644cad8c755.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/how_to_reset_casio_pcr-t500.pdfIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_c5241f12820046e7bcfdf08c9ba9a82a.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_e69606ff76b44c079d8e4301bbfcee91.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_067729eb92e84895a41206655a8744ca.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_facfeba582da4cf38f3e29300c27c2b6.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_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 5460 bytes
SHA-256: 49a4d58a64108693b168a364aefcc196c228e72838d08c4eab8dc2738cdeb209
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 10324 bytes
SHA-256: 28c0fb6664414aea6b459ee785a5c6858bf6e97988302ce0569f037e2b6b7bd9

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