Malicious PDF — malware analysis report

Static analysis result for SHA-256 4860539ab20bf0fb…

MALICIOUS

PDF

106.1 KB Created: 2021-02-22 10:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 516c74b9322ff12403013fc62b2edcc7 SHA-1: 11f292f5d43dfc3e47b9633532074316ab1bf4d9 SHA-256: 4860539ab20bf0fb0e198878f2f82e17d2ee02ce396ee20458dc5c09458a6718
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, with 'http://wekujugom.epizy.com/catch_22_movie.pdf' being the first identified. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external sites. While no scripts were explicitly extracted, the nature of the link farm and the ML classification point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=how+to+explain+thermal+energy PDF link annotation
    • http://vowidobiwe.22web.org/lelukigotedigumo.pdfIn PDF document text
    • https://jonurimexiv.weebly.com/uploads/1/3/4/3/134321783/dubasatoteganitute.pdfIn PDF document text
    • https://dazowuxope.weebly.com/uploads/1/3/4/3/134319454/5350526.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/f71652a7d.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/9481250.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekujugom.epizy.com/catch_22_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/ludiv.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/91753978754.pdfIn PDF document text
    • http://kalesas.rf.gd/fewira.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/xumugifulipemoxufebiza.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/business_informatics_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/biotek_multiflo_manual.pdfIn PDF document text
    • http://lebasadalo.epizy.com/jokonukegoxokidunotun.pdfIn PDF document text
    • http://pumovumibabir.epizy.com/gedabi.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/advertisement_format_english_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/amenaza_de_parto_pretermino_nifedipino.pdfIn PDF document text
    • http://zalezir.epizy.com/fokepa.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/xotebepofasubok.pdfIn 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_off00016036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16036 5280 bytes
SHA-256: 11e03d5eb3c0949be1ab29f85a4d7be11c188a825b74f31880d6c7fa5a311582
font_01_sfnt_off00017219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17219 12116 bytes
SHA-256: 6ce844fb2ebaa01d1d5585c64496c5ac084966c0c0576c07a2ef767da32a1422

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