Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e408919220dd76…

MALICIOUS

PDF

96.0 KB Created: 2021-03-26 17:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 712e9a85ff552fd089830fd1a6cd3eb9 SHA-1: 90ef51799024d171d59e449422fb0006ad7fec0f SHA-256: 49e408919220dd768522e4100bc52d2b1b331835177f51358a038e15c8db95e9
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 likely part of a link farm designed to improve search engine rankings for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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://vilenefex.ru/award?keyword=catering+management+books+pdf
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/nuteja_somavamuxofisa.pdf
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/vavato_nojebidakusin.pdf
    • http://topukovatawosu.sportsontheweb.net/tegeguzogopumuxufefibi.pdf
    • http://neuroncraft.online/xilusezadejepiwipuda2jf32.pdf
    • https://kebomekol.weebly.com/uploads/1/3/5/3/135349545/juvalusis.pdf
    • http://microbladingcertificationdfw.org/49378349169yt75h.pdf
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/dodogegaxabigiga.pdf
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/5704759.pdf
    • http://nasporte1.fun/childrens_basketball_hoop_setihsw6.pdf
    • http://trend-sales.fun/94446655534qqwak.pdf
    • http://ellmax-site.xyz/fegav0tbyv.pdf
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/fisimekewivipipufijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woneketelak/fazusinedebolasibiwatas.pdf
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_d091848ff77b4de1af9234082ce3778a.pdf?index=true
    • https://s3.amazonaws.com/jadudusujuje/barack_obama_speech.pdf
    • http://gavawekib.myartsonline.com/personal_pronouns_worksheet_grade_4.pdf
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_ea647dbb879f4260bf8ca7202f902d35.pdf?index=true
    • https://s3.amazonaws.com/gafedupeba/bugatinewudozivowu.pdf
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_129bdddb504f457a97a09aa454607cac.pdf?index=true
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_b23386bfe2754ff890879241e54bec85.pdf?index=true
    • https://s3.amazonaws.com/gifojuxaxeva/wrong_turn_2_movie_mp4.pdf
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_a770b6296e254b39acae6d6f75fa0889.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/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013697.bin
2bfee0b50d40890894391b8f116278bc0f3f8915fdc8234de0fab73543599c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 5436 bytes
font_01_sfnt_off000148fa.bin
1517e601658d847d88034d51b8378215de39a415ce47b3ab76d84b7f6cb65f07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148FA 12668 bytes

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