Malicious PDF — malware analysis report

Static analysis result for SHA-256 e946696b2fcd2417…

MALICIOUS

PDF

78.8 KB Created: 2021-02-23 18:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 82262835ed72d3fb8a2f434d81a037ce SHA-1: 731348cde29556d651f5d1ef15cdb82625e6c613 SHA-256: e946696b2fcd241739b2420bc89827f763eff9f673fc7ecd113456786e7bfd67
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are disguised as reports or documents, indicating a link farm or redirection strategy. The primary malicious URL, https://maypoin.ru/strik, is likely used to deliver a secondary payload or redirect to a phishing site. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF structure itself being manipulated to host these links.

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://maypoin.ru/strik?utm_term=how+to+replace+heating+element+in+tumble+dryer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5ffe07d84ff1e.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/puretudusuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_600ff30356066.pdfIn PDF document text
    • http://zebrait.fun/bebuliwoxetobububojefon97kic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466364/normal_5ff8f3dd196e4.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/23e50ad9dc70.pdfIn PDF document text
    • https://jabapimodixo.weebly.com/uploads/1/3/5/3/135314731/a67e4c97739b12c.pdfIn PDF document text
    • http://infokurs.design/49054764227qw4ap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5ffb699f6c926.pdfIn PDF document text
    • http://burrrhey.tech/18754977416fd8y7.pdfIn PDF document text
    • http://verification-help.com/170931139errrk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jusagi/reports_emias_mosreg_ru.pdfIn PDF document text
    • http://wafibajew.epizy.com/chsl_2018_answer_key_link.pdfIn PDF document text
    • http://fobexegedun.epizy.com/roxoxewe.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/43764319914.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/alkene_alkyne_and_aromatic_nomenclature_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/avery_labels_5160_template_blank.pdfIn PDF document text
    • http://rififaroneg.rf.gd/catch_up_tv_guide.pdfIn PDF document text
    • http://nagukubuliduz.rf.gd/60580721000.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 5484 bytes
SHA-256: 15b67ab377e6b232e3b119aaca75b9b35791b647cf26697f6769464ebb3a94f2
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 10660 bytes
SHA-256: e29a125e8cdfaddde3e0f6baac99fb62cfd312fe65df1ff86aed3deed1abd495
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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