Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a47d76f9b97f864…

MALICIOUS

PDF

84.1 KB Created: 2021-04-01 16:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3a062d17863078961c621fec558ade01 SHA-1: 581c739d0d205b98abd16e107665ea69a1074d5e SHA-256: 0a47d76f9b97f86459eee84dc8a8bbc939a07231b347b86abc45d2ec8ff23c4e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the primary URL being `https://ponafet.ru/award?keyword=exercicios+de+arcadismo+pdf`. The heuristic `PDF_SEO_LINK_FARM` indicates the presence of numerous external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or content-farming scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=exercicios+de+arcadismo+pdf PDF link annotation
    • https://cdn.sqhk.co/warugariluxe/FWHibif/56089844309.pdfIn PDF document text
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/3961935.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/kCjVnUZ/retoluginusimeke.pdfIn PDF document text
    • https://cdn.sqhk.co/gunumiku/ghqiije/99756601338.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/dawuv.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/tixowugewima.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/vafimubufig_kogomozoj_voruwipi.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/xuniwazidelajudoxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titugol.atwebpages.com/97716839420.pdfIn PDF document text
    • http://kufosogedojafu.epizy.com/39620454991.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_8b5e0c81c0ff4f50974e12bba0b67396.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_d08fdb68dbb249c58188fa1f9098c7b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/tufavudawugadakoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/ms_word_course_syllabus_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/29137216078.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_defec0233a914aa29664176ad07a2c10.pdf?index=trueIn PDF document text
    • http://wumugajus.onlinewebshop.net/opposite_words_english.pdfIn PDF document text
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_f85c73f159414230a792173ef759bc08.pdf?index=trueIn PDF document text
    • http://gesesasogibigaw.rf.gd/math_addition_worksheets_up_to_20.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/62661422400.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/auxiliary_verbs_examples.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_4ab722d95d0d4005b1d3312ecef8bf52.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_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 5292 bytes
SHA-256: 53546fa4f3e76c23e34261d8016baa9887b880662260919f8858a4d823e180af
font_01_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 13344 bytes
SHA-256: d3c7e3a64f65c56bac90a0ae73a85731d577a129c6881dee8543c330add65ec2

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