Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb2e341be814d9f…

MALICIOUS

PDF

83.0 KB Created: 2021-03-21 02:35:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c488d93a44e71f16d92272f54017ce31 SHA-1: 1af5de684b24a048b423f75f815335eed134f4e1 SHA-256: bcb2e341be814d9fbe9687f4fd4c9becfc64d319843de082a1686630fbae4c74
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to direct users to potentially malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The presence of a URL like 'https://kuzutuzo.ru/strik?utm_term=wd+my+passport+1tb+compatible+with+mac' suggests a lure related to computer hardware. ClamAV and ML classifiers also flagged this PDF as malicious, supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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=wd+my+passport+1tb+compatible+with+mac
    • http://womumonafip.22web.org/77507278305.pdf
    • http://volulolusawaz.mygamesonline.org/10461429567.pdf
    • http://rowexusaje.mypressonline.com/dirt_devil_power_stick_filter_f2.pdf
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/339017.pdf
    • http://sipebep.22web.org/how_to_remove_kidde_co2_detector.pdf
    • http://zugemenelil.medianewsonline.com/chrono_trigger_frog_theme_piano_sheet_music.pdf
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/365a711.pdf
    • http://gonaxepafa.iblogger.org/joderobesiwox.pdf
    • http://votixibutiro.medianewsonline.com/36899638859.pdf
    • http://jufidozotazi.66ghz.com/tegavexu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c588ec2e-a07c-4f2c-bcfa-f1c2a6f795bd/cyberpunk_2020_weapons_list.pdf
    • https://uploads.strikinglycdn.com/files/d0fa9f7d-0a54-4f52-b14a-37b0adfe35e8/learning_chess_app_free_iphone.pdf
    • https://uploads.strikinglycdn.com/files/0026058a-21b0-4069-9978-317730504d72/fepupekevefodal.pdf
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_a1f6f51e292e4cc3a5788262bed4a945.pdf?index=true
    • https://uploads.strikinglycdn.com/files/03afda37-76bd-4817-9565-ed2844a9d9cd/how_to_summation_in_excel_formula.pdf
    • https://uploads.strikinglycdn.com/files/7a408e9d-0aac-4ab3-a6fa-8328f9ef9ced/30029378631.pdf
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_91b50f08309f4c70b9b06f7d9136817a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/016022cc-fcf1-49f2-9b83-5c64e54c74e0/67163818328.pdf
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_0ec5893afa2649ecbc2d3c1e9b15e41f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/77ef9547-1f75-4abf-8523-1af07797b8c1/how_does_a_sensus_water_meter_work.pdf
    • https://uploads.strikinglycdn.com/files/aa1ebed3-01d7-4683-8974-43ac6935d41a/lanumogesilan.pdf
    • http://jofesosozofoso.epizy.com/job_application_letter_with_resume_format.pdf
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_2dfb4b5918a34eac8c34489ce3b1d2a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49dc54ff-b381-4827-ae43-fb3befac21ef/the_checklist_manifesto.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_off000106aa.bin
48a86507ed21e92ce26cb477cbc106ab9c730bd93316d821c3976bd7f5f53675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 5712 bytes
font_01_sfnt_off00011a0a.bin
4603cb05ae54e5ff7efa9da96eac28549f5998868a0fd28f6eddbdf1eec03b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 10488 bytes

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