Malicious PDF — malware analysis report

Static analysis result for SHA-256 c90078d1c54baaa9…

MALICIOUS

PDF

76.9 KB Created: 2021-05-03 20:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99300d03f8c702e275b19a5b41eed800 SHA-1: 5fef86fc1e595b4022cfa959ddea356184c23186 SHA-256: c90078d1c54baaa9f4e16c8a4568fe2b4efb8e489c9e6a49a6102bbf6212cf41
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain ('ponafet.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

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=american+megatrends+bios+update+msi
    • https://sabutiwageb.weebly.com/uploads/1/3/5/9/135992853/wejowolifunujuvedum.pdf
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/jitimorulapal_lusozodijonugi_fivowukuveba.pdf
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/gusoridadav.pdf
    • http://muxadar.22web.org/adobe_reader_not_opening_on_mac.pdf
    • https://torimavilok.weebly.com/uploads/1/3/5/9/135984964/nekerozifir-runated-junavel-bawemubekoxaxi.pdf
    • http://dusosax.66ghz.com/lamerafekakusimegen.pdf
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/kapunekadidifej_lulinenaragi.pdf
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/6716849.pdf
    • http://bivoxuwod.iblogger.org/retail_marketing_exam_questions_and_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dedinavesute/technical_drawing_engineering_drawing_symbols_and_meanings.pdf
    • https://s3.amazonaws.com/sazomo/49082967102.pdf
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_a23add39d7aa49a28b09cfa8a499833a.pdf?index=true
    • http://nobosatif.epizy.com/93310973956.pdf
    • http://koferajovu.epizy.com/how_to_replace_a_poulan_chainsaw_chain.pdf
    • https://s3.amazonaws.com/pizexopenaxu/29559353111.pdf
    • https://s3.amazonaws.com/wegugus/what_are_the_instruments_used_in_singapore_traditional_melody.pdf
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_e1571ca34e65467e8dca5833eea9b620.pdf?index=true
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_3da03355f08840cb888386dd42d87a03.pdf?index=true
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_165b4302495a4355abdfd9f27a7f4e72.pdf?index=true
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_35d1cebf68154eabb07e2a459bbb841c.pdf?index=true
    • http://patikogoxuxit.epizy.com/regaremarukuwufunap.pdf
    • http://vofefigekoloru.epizy.com/what_are_the_steps_in_a_trial_process.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccd.bin
103115d37df20cc5674a0b3b07982cbe1b69399be11d47bb11ac97a0aa06286b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 5488 bytes
font_01_sfnt_off0000ff5b.bin
02d2c7a23069de5bdbfff9cc8f75009c122008a99021a42fb68328f561861d97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 11332 bytes

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