Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94f3edc8df8f604…

MALICIOUS

PDF

73.4 KB Created: 2021-02-08 01:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 27fd90d87bd2cd2ddd59fa52531a6918 SHA-1: 3b351b197c4cd2bda1526cc611a5ba6bf9910416 SHA-256: b94f3edc8df8f604a55700d67926f3ebf9811017fd73e29aaa3d3e4d17731ab5
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF identified as malicious by a ML classifier and ClamAV, specifically as 'Pdf.Phishing.Trojan'. It contains an embedded URL that masquerades as a document related to 'dihybrid cross questions and answers', likely a phishing lure. The PDF structure itself is also suspicious, with duplicate object bodies, suggesting an attempt to evade detection or embed malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=dihybrid%20cross%20questions%20and%20answers%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403946/normal_6005906386b23.pdfIn PDF document text
    • https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/zumegalanabege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fe6196440556.pdfIn PDF document text
    • http://djami.ru/dobabuzuwuvozupu6h5lp.pdfIn PDF document text
    • https://cdn.sqhk.co/zujadibarise/GdPhRgg/sebumikof.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/wogitevabufeke.pdfIn PDF document text
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/tufomexuju_tagapasirebiw_zetidowaxasino_futuzukuv.pdfIn PDF document text
    • http://lozhobelir.space/wudosewawuvuvoxupisimag1jyyw.pdfIn PDF document text
    • https://cdn.sqhk.co/vigasigetogi/B99hchb/fly_away_birdie_sara_gazarek.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/Ijeifxw/my_cloud_home_setup_windows.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_5fe825d513070.pdfIn PDF document text
    • http://3bureaureport.info/jiffy_crossword_answerh1u7o.pdfIn PDF document text
    • http://barashik.space/az_dmv_abandoned_vehicle_form16m0b.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/cjigdcV/hungry_fisherman_restaurant.pdfIn PDF document text
    • https://titoboxe.weebly.com/uploads/1/3/0/8/130874676/d2a1ae2010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xupimaral/rejibogobube.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/66723516464.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/capsulitis_adhesiva_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/50606178915.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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 5672 bytes
SHA-256: cefffe05e1a7dc6ad1b20d3c80e1511194e94ec177be5e105697de5893cad57c
font_01_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 2252 bytes
SHA-256: a6a8686b8fb15c9717d15c6992f5cb6599fab98c9eb18a738509255b94a7d84e
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 11060 bytes
SHA-256: 1ce813141fa1fb975afca828a251ccc088ebf49cd3cbe0129312d69093a21548

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