Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aebf5c2c05a2a2d…

MALICIOUS

PDF

82.3 KB Created: 2021-05-24 18:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1faaf6bbdd8709362dff9cec8a3a2555 SHA-1: ef6f5ea9c42e10eff85f9527fc390835952f2c85 SHA-256: 3aebf5c2c05a2a2dfbff6eeed8cfb0f733a614a9527c394c2057bbcd253d59d0
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, suggesting a link farm designed to direct users to malicious sites. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/strik?utm_term=renegades+and+heretics+9th+edition+pdf PDF link annotation
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/lofogojoz_dejisajinagege.pdfIn PDF document text
    • https://sowubibuf.weebly.com/uploads/1/3/4/3/134308786/6fd3ccc75d23122.pdfIn PDF document text
    • https://zejanedigerexig.weebly.com/uploads/1/3/4/7/134757062/8049422.pdfIn PDF document text
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/nadobijawedirolevis.pdfIn PDF document text
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/77f15f707f483.pdfIn PDF document text
    • https://guvopizap.weebly.com/uploads/1/3/0/7/130776702/vegoliseza.pdfIn PDF document text
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/4273128.pdfIn PDF document text
    • https://vizijupazikek.weebly.com/uploads/1/3/2/8/132814338/5404436.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/vikamutubupazita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3619a911-a096-4045-b4e2-3d76d477578b/how_to_connect_bluetooth_headphones_to_dish_hopper.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/huawei_y9_2019_android_pie_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c60062a-e147-4b20-9df2-b7f05896f40e/how_much_do_first_grade_teachers_make_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/076dbe16-a1ab-4e94-8863-ff7495e7218f/el_principito_libro_completo_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd65fa56-fbec-4f91-ad91-fc33908e6d1d/2008_jeep_grand_cherokee_srt8_motor_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad81e020-a773-4ab2-a3f9-860b07c30628/87707531611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25202427-7e76-44bb-ab24-1ec06a4e0499/journey_to_the_west_movie_download_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/brave_browser_rewards_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6beccfe-d2b1-4297-b0ec-8cca10106299/micro_usb_charging_cable_wiring_diagram.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_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 5548 bytes
SHA-256: 291f2a79e64ee5e540dc9645e6323cb4f2f93455d0e95e552567737003c1dc14
font_01_sfnt_off00010d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9D 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 10900 bytes
SHA-256: ecc81bcf19c50a98af0c1c6596b8cf855c451109f87e662f232f17ad4809edbe