Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b639b5134e4dbb0…

MALICIOUS

PDF

73.9 KB Created: 2021-04-03 23:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 571bae95e72a80aee90fd3c4ea659177 SHA-1: d6e254ee2be7b535fd3277d92b76f275c98ed871 SHA-256: 4b639b5134e4dbb0cfb18136c9783aaf1e61b2095309b67872e3430f11ebad5a
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a malicious domain, likely intended for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Mr coffee instructions'. No scripts were extracted, but the presence of external URIs and the overall malicious classification point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=mr+coffee+instructions+4+cup
    • https://static.s123-cdn-static.com/uploads/4374002/normal_5fe1a444803f8.pdf
    • https://cdn-cms.f-static.net/uploads/4421787/normal_6033c012a2984.pdf
    • https://cdn-cms.f-static.net/uploads/4416653/normal_600c528a30bf6.pdf
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe4d7dbbc2bd.pdf
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5fec05b8e0911.pdf
    • https://womazineput.weebly.com/uploads/1/3/4/8/134895737/3866303.pdf
    • https://cdn-cms.f-static.net/uploads/4425908/normal_6059d4a733a83.pdf
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/5057880.pdf
    • https://cdn-cms.f-static.net/uploads/4377128/normal_603d0bd58daf3.pdf
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/76f4de5.pdf
    • https://devogenigibef.weebly.com/uploads/1/3/4/5/134501446/xosuromus-tufako.pdf
    • https://cdn-cms.f-static.net/uploads/4476947/normal_603e27fa33005.pdf
    • https://delezebewokumod.weebly.com/uploads/1/3/0/7/130776218/jemumuratolu.pdf
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5fcf4da85331d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waduzirader/ruzivulotoniduxatasega.pdf
    • http://wugupijejituzog.rf.gd/swagger_codegen_3._0._5.pdf
    • https://s3.amazonaws.com/mizeteb/high_probability_day_trading_patterns.pdf
    • https://s3.amazonaws.com/rujabepifar/black_s_law_dictionary_4th_edition.pdf
    • http://zadobimad.epizy.com/sydney_harbour_bridge_traffic_report.pdf
    • https://s3.amazonaws.com/lumixi/38077099673.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e502.bin
09f71c62b572ecb18614adab8f5c8d33062e528a8c7cbc6a6d2e294dd7ce5d56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 4860 bytes
font_01_sfnt_off0000f5b6.bin
08d538ad693ed6e26c997d9ca0db5e04bfa0db256606e3011114d870bb6ea455
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 10800 bytes