Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da1ff4c451ae7ae…

MALICIOUS

PDF

76.4 KB Created: 2021-03-20 23:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8899e7a4d15c0bb9c054bd9fd474d5bb SHA-1: 5502be45cad74f1f0b09441fa906983078d2cb0f SHA-256: 4da1ff4c451ae7aee9e39cfe232b199fd83d7cb48233d781a7821b10a7960009
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links, with one pointing to 'http://pilulozames.epizy.com/boot_camp_exercise.pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mezovuduw.ru/wix?keyword=ge+refrigerator+ice+maker+repair+manual
    • http://jabilevij.mypressonline.com/quadratic_sequences_worksheet.pdf
    • http://wobifotos.mygamesonline.org/kotovevizurezuw.pdf
    • http://riwalimuj.scienceontheweb.net/numuwigusijadopipiw.pdf
    • http://gagimubu.mywebcommunity.org/vadogilegilipozaxubiw.pdf
    • http://gajaxujifusokul.mygamesonline.org/fosimenijif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pilulozames.epizy.com/boot_camp_exercise.pdf
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_850c1eaa9a3241ca84069f541d7e7c9f.pdf?index=true
    • http://valupakukav.myartsonline.com/berenstain_bears_books_read_aloud.pdf
    • https://uploads.strikinglycdn.com/files/88c2cd1c-4c47-413d-81f2-4aedf47c8391/fevano.pdf
    • https://uploads.strikinglycdn.com/files/f2e640b6-dc18-479b-acc1-b5005e3ccb47/mujodunokuju.pdf
    • https://uploads.strikinglycdn.com/files/acc6cc43-cb58-4f6a-ac1e-c55915cfce38/how_long_do_i_cook_my_turkey_in_the_big_easy.pdf
    • https://uploads.strikinglycdn.com/files/7d845a82-d45c-4ec0-b8e8-4f70bdbc7f45/project_management_tools_free_download_excel.pdf
    • http://xapimiwosusuv.epizy.com/purirer.pdf
    • http://vujuvisesakok.myartsonline.com/fun_activities_for_english_learning_students.pdf
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_5d6ce6264b09494a8b7ff11f5eafa639.pdf?index=true
    • http://gukexusew.epizy.com/arkansas_drivers_permit_test_requirements.pdf
    • http://gosaduzunake.myartsonline.com/78396103994.pdf
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_23774f99a43b49328fa06d13b72ee565.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8a132676-476a-4a6f-87d0-8c7de641da6e/78683287669.pdf
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_91851a3eda0343d6b943d3fd458e2092.pdf?index=true
    • https://uploads.strikinglycdn.com/files/afca6ec2-8cd2-4bd4-beb2-db431d111c92/83875972780.pdf
    • https://uploads.strikinglycdn.com/files/dd73680e-e78b-45e7-975f-cefaa624b090/mowemivesunajo.pdf
    • https://uploads.strikinglycdn.com/files/a99b17ab-580f-4e36-ad85-dbeb2381708d/serato_dj_pro_download_free_mac.pdf
    • http://webekilijonelew.epizy.com/why_is_my_wireless_phone_charger_blinking_red.pdf
    • https://uploads.strikinglycdn.com/files/dc045124-35f6-4935-ab00-68d73c886891/kimetewikevevudaxesos.pdf
    • https://uploads.strikinglycdn.com/files/71a90d56-6884-4cdd-ac9c-0e445be8720b/8950550888.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_off0000ee68.bin
03bb6a4c42485b07c7880704c093b6752e6f1c8a299610288e821d8ff3262327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5252 bytes
font_01_sfnt_off00010042.bin
4efeffc1ec02e4043f5314ed5319280991fe99a4b9ed917a686c24c057ac884a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10436 bytes

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