Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebca73ef99d1565…

MALICIOUS

PDF

79.4 KB Created: 2021-04-25 02:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 27275cb9c4e7a7254f026ae9af2ac75b SHA-1: cbed188582c0043fa95a9cc7509a7124f5eb443d SHA-256: 5ebca73ef99d1565d09d929393570be0094aebc84e5885be820c9e052299ffe1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to 'how to load a bobbin old singer', directing users to a suspicious URL. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=how+to+load+a+bobbin+old+singer PDF link annotation
    • http://relax35.ru/romukotivoxiwirixexod9efy.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/describing_trends_vocabulary.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/mavabugudegebaluzef.pdfIn PDF document text
    • http://hugertely.xyz/69167285526k4wi6.pdfIn PDF document text
    • http://kuvobutigok.iblogger.org/sun_joe_electric_pressure_washer_not_starting.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/highhih/word_swipe_app_game.pdfIn PDF document text
    • http://rakajipof.22web.org/xbox_live_issues_signing_in.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/wifibomopirigaxajovira.pdfIn PDF document text
    • http://health2health.online/16525210439fxl3f.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/14039915749.pdfIn PDF document text
    • https://cdn.sqhk.co/rexixugepir/ohgiNyT/36769478038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_22b1c09a29c24ee6a83b58a5e9fb6a74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc82929d-4ee2-44f9-bbb2-165cdc4734ec/rirepegunenipojofogo.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_5ce364beb1164e5fb23aecb301d8650a.pdf?index=trueIn PDF document text
    • http://vipukexevuwe.epizy.com/43616813693.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_27b7e082802f4a5a8f2070b9d4ce41d1.pdf?index=trueIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_8e440c66eee24b279a20ee2aedd81777.pdf?index=trueIn PDF document text
    • http://tarobajasupimi.epizy.com/cystic_neoplasms_of_pancreas_guidelines.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_13cb20c2218c46d7943e640f32909f38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/761912f7-6e14-4d33-83ba-5d8ff7ec411b/twilight_saga_eclipse_part_2.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_off0000ebc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC4 4976 bytes
SHA-256: d6ba3d7aed31101c46f6b758506acf78f3638dfee965f600c37680c74c44aaa2
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10592 bytes
SHA-256: f39e6d7219f343d750404368e58eaaaff65752bcec655a9cb38bed8793205421
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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