Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d31698ab40cea0…

MALICIOUS

PDF

90.2 KB Created: 2021-03-10 20:49:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e93299e19b6cf33f130cc4c3ea6b430a SHA-1: 54b3681c6866fa8d845f35dc63bb2c32ad9f7a4b SHA-256: a5d31698ab40cea076e92295a781abd175497e724d6b65065487d7114f731da6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=antigone+pdf+translation PDF link annotation
    • http://dosijefa.mypressonline.com/fumos.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/foxitox_nivesebarus_tepotavowov.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/4463859.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/ppsc_jobs_2020_advertisement.pdfIn PDF document text
    • https://saranadizalexe.weebly.com/uploads/1/3/0/9/130969301/puxubebususejixuz.pdfIn PDF document text
    • https://xogowabixebeva.weebly.com/uploads/1/3/4/6/134612916/730362.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/535681de2357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_4d7244c74a564cffb2fdf14672c20c73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/gusoki.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_e8083619e9b545919c2f30584cb48fea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/rafuf.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/amazfit_stratos_watch_faces.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_15c722a97c0148a0849e813fbec8cb1a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/zetesa.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/chiari_malformation_indications_for_surgery.pdfIn PDF document text
    • http://desejole.myartsonline.com/citizen_mens_eco-drive_chronograph_watch_with_perpetual_calendar_and_date_bl5400-52a.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/gliomatosis_cerebri_vs_glioblastoma_multiforme.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/64874010236.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/mevagitulu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 5200 bytes
SHA-256: 9a26a42ee1923ad3e5bccc04051c4196fb434bed1a4440605a09298e4d077a90
font_01_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 12908 bytes
SHA-256: 09a1c9a9ac2421f29ca5b46fb400cb10ee9692ced55c7f03015dc6668ea6e3f3

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