Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe78332aabd75a48…

MALICIOUS

PDF

75.1 KB Created: 2021-05-22 22:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8671f08eadac23f9fd6945463af4a519 SHA-1: 99fbd74df4a01eb527afe2780bd249be37f8964e SHA-256: fe78332aabd75a48ef0eb5efc5c91f7b3243748c27c71b1458ceb4b20e1ae3bd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, particularly the one related to 'materi osn biologi sma 2019 pdf', suggest a lure to disguise the malicious intent. The presence of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/strik?utm_term=materi+osn+biologi+sma+2019+pdf PDF link annotation
    • https://bojowavezuzabi.weebly.com/uploads/1/3/1/3/131382797/mimidebev.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/628607.pdfIn PDF document text
    • https://golotelarag.weebly.com/uploads/1/3/1/3/131382536/xewevovow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/139e8953-94f1-4101-8c59-af9980c0438e/garmin_delta_xc_sport_collar.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/brief_formell_englisch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60141348-8c37-4d17-8ad9-0c2427f909d0/fixidezewupetotujowaze.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/id_card_design_template_ai_file.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/35213880150.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/45286714819.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/workpro_12000_series_assembly_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/ap_lang_rhetorical_analysis_thesis_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/97427977141.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/acc_aha_heart_failure_guidelines_2016_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/fakezinibirifaxokevel.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/guvisuximugafuvobijagukin.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/badakawita.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/windows_7_sp2_32_bit_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/luciferase_reporter_gene_activity.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_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 5988 bytes
SHA-256: 1d876add9291425dd7e4dc617f3b4e61c583413205827ebcb6e2095098635a96
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10512 bytes
SHA-256: 1dd8890e9c7ec9b3f1eb7677d546fcf2f663a1c9e32ec84cfde67158c5972837

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