Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa1090358970c47…

MALICIOUS

PDF

68.7 KB Created: 2021-02-22 10:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 22d963a0d752b8f306ccae2ea54b2fc3 SHA-1: 337de37a6ddb2fe011ab8cb853011f65638640f9 SHA-256: 5aa1090358970c4794cb878a6ea80c3dff371f9e11e59a88c4821d2e1dcd7581
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 pointing to S3 buckets and Weebly domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=a+gathering+of+shadows+collector%2527s+edition PDF link annotation
    • https://zaxalaxixu.weebly.com/uploads/1/3/1/6/131606365/3571535.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/5534130.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/8474222.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/8518654.pdfIn PDF document text
    • https://gakififevorejep.weebly.com/uploads/1/3/1/8/131872199/6867264.pdfIn PDF document text
    • https://lofativunami.weebly.com/uploads/1/3/4/5/134581692/8925295.pdfIn PDF document text
    • https://liramuxusere.weebly.com/uploads/1/3/4/5/134577046/128964ea.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/gotizapevixasaveru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/confounding_variable_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/75561459072.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/47270983589.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/16367535304.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/beko_washing_machine_manual_wmi71641.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/felokotak.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/blue_cross_of_idaho_contact_information.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/fuxisaworawosibo.pdfIn PDF document text
    • http://fanuzisi.epizy.com/element_compound_and_mixture_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/5147807264.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/93796699374.pdfIn PDF document text
    • http://burufag.epizy.com/9176245268.pdfIn PDF document text
    • http://wiresudakijiwa.rf.gd/dangerous_goods_storage_regulations_wa.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_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 5396 bytes
SHA-256: 6b35e8bffb97b2787a233af2140bd50781a9acd330bba7b384d0603ccd59badf
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 10612 bytes
SHA-256: 379446f747755b7da44a4881f9605f33ae579519a20cab4d148311e1ed2448ab

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