Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93602bc2a4479c3…

MALICIOUS

PDF

80.5 KB Created: 2021-03-26 11:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 418d8b8e4f06035662ddecb18b1fadb3 SHA-1: 994f27377a2a77c70106d83ced811110c983d018 SHA-256: c93602bc2a4479c3e296180601e5171e6d7aa3cee8730443357792b4975dfd2c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://ponafet.ru/strik?utm_term=casio+watch+alarm+chronograph', appears to be a lure for users searching for specific watch models. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=casio+watch+alarm+chronograph
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fffa185e191c.pdf
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fdcb2a61425c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lekelepowo/23705970450.pdf
    • https://s3.amazonaws.com/folexapurilowe/codehs_answers_java_mocha.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/fabofilizogozifanapomitat.pdf
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_273d2cbb376b49a7867b4a4951e305bd.pdf?index=true
    • https://s3.amazonaws.com/seriposuj/16909412091.pdf
    • https://s3.amazonaws.com/mefonevimimix/45845198092.pdf
    • https://s3.amazonaws.com/watajive/51874794480.pdf
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_e5b562f2f2ca4d86bfa5f73443527712.pdf?index=true
    • https://s3.amazonaws.com/voxipanovigepiv/9464437850.pdf
    • https://s3.amazonaws.com/ropuba/ajagz_quiz_questions_and_answers.pdf
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_64189c2905fe472d93e147b779091a17.pdf?index=true
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_705e144994654464823da5e09fa89dec.pdf?index=true
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7d60d586912a4363b62a4230ef0a1cb0.pdf?index=true
    • https://s3.amazonaws.com/kelageketisefuv/rimawoser.pdf
    • https://s3.amazonaws.com/naxizugenabi/orange_answer_machine_number_uk.pdf
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_d26bc06be1f14ecf92b18c175cfb0071.pdf?index=true
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_837f1294ad054ac5a1b78ea30a933484.pdf?index=true
    • https://s3.amazonaws.com/ladojenefe/naniw.pdf
    • https://s3.amazonaws.com/najubu/after_words_movie_free.pdf
    • 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/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02e.bin
5c509dcaef69f341afa56dea05fc308d8415a1618ff85a05ebf1560cf99ab4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 5132 bytes
font_01_sfnt_off00010185.bin
aa57fdb3b692bc6246ae4ff2b8cbc4280cc08ad7a452fedff13c61936e4bbd99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10880 bytes
font_02_sfnt_off000126bf.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 4324 bytes

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