Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd6f408e6655592…

MALICIOUS

PDF

75.6 KB Created: 2021-02-28 11:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 596178f00e1de8238e5e5371917e13fa SHA-1: 782efae0bb8f5e30e7ca53592cbf3e1f91333c09 SHA-256: acd6f408e6655592ee16887fa49bfeaa79ef7b666fd75fbd98d3ebf50439240e
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. It contains embedded URLs, one of which, 'https://kuzutuzo.ru/strik?utm_term=grammaire+progressive+fran%25C3%25A7aise+livre', is directly referenced in the heuristics. The document body, though heavily garbled, suggests a lure related to a French grammar book. The presence of multiple suspicious URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/strik?utm_term=grammaire+progressive+fran%25C3%25A7aise+livre PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480399/normal_601717970eca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_6011467716aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457014/normal_6029c97597cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_6025156fde6a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392650/normal_600969d20c972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_60243091d1cfb.pdfIn PDF document text
    • https://cdn.sqhk.co/tirinakiweda/tuhiT5H/vortex_cloud_gaming_android_fortnite.pdfIn PDF document text
    • http://nat-fru.space/suserak76xzm.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/Igfbkbv/temple_endless_jungle_run_oz_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450160/normal_601b77095dc1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5ff13cde80eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405419/normal_603abaffbcb5e.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/d3gejb4/76963464488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_6029f8824dcf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462714/normal_5ff7cd2c7f2d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410730/normal_5ff96d1ac99ec.pdfIn PDF document text
    • http://idealsit.space/xedofoxidivis12c3d.pdfIn PDF document text
    • https://cdn.sqhk.co/vomuvojovi/bZAg5jc/74227985482.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 5496 bytes
SHA-256: 1beaa9de7ec72ebcd73171a151262f5cf23bcf44cda689c53ce11e95a3488958
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 15456 bytes
SHA-256: 9f2c9ea49da494a24cac144eb0d981f696f92d2c9fef2b3e4cb8279558af4361

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