Malicious PDF — malware analysis report

Static analysis result for SHA-256 5015454bfb132cd0…

MALICIOUS

PDF

70.3 KB Created: 2021-04-30 18:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 16a2ff78ccc736177273770743ec6f13 SHA-1: 220e91043d8e4b76aa590ad45b9fc13be7179022 SHA-256: 5015454bfb132cd0e95f0b835776119668e0f7b9ce2a2ab747841e41afbfd200
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings point to the document acting as a link farm, with numerous embedded URIs directing to potentially malicious or phishing sites. The primary URL identified is https://soxebez.ru/strik, which is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=sony+soundbar+sa-ct60bt+lost+remote PDF link annotation
    • http://goromeo.club/buenos_libros_de_fisica_basica_con_ejercicios_resueltosuud0e.pdfIn PDF document text
    • http://rubeatyshop.xyz/nawonapajiyyp7u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5fe819e7f1feb.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/43206373593.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/arduino_uno_tutorial_deutsch.pdfIn PDF document text
    • http://munasimowijuxi.getenjoyment.net/lowexom.pdfIn PDF document text
    • http://mscredit.info/bibliology_download5v4xj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473619/normal_6007c7764a75d.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/what_is_an_anti_inflammatory_diet_for_dogs.pdfIn PDF document text
    • http://jesawukimefix.mypressonline.com/catchphrase_quiz.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/aircraft_design_a_conceptual_approach_6th_edition.pdfIn PDF document text
    • http://stavki-na-sport.site/kiwazogafoguzaximewegeau1l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_603b4cc91502a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejopirobi.epizy.com/north_carolina_controlled_substance_reporting_system_database.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63a5a01-62f7-4e49-9bd1-483a13bc44a6/67773189340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524b34ac-45f1-49a7-878d-b63628f70252/18850659620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7070314d-20eb-4c0c-a565-e66da417ac4d/how_many_watts_is_the_lg_smart_inverter_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3fa1c2-0958-42be-9dcc-85da2689ca8c/tokamesopib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ecc098-548d-4b14-9bdd-b1e2dbf48df8/what_does_l_o_mean_on_a_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d98a244-f069-4971-91b5-aaccc36971e4/devilbiss_pressure_washer_for_sale.pdfIn PDF document text
    • http://roxewew.epizy.com/77142492603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517a5e80-c83e-41df-abff-51471d1b6310/93300272494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70520191-6ebd-48fb-addc-bb04d903b289/the_little_sparrow_cartoon_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc3203d-363a-4559-be47-c5526b9a9d8c/62644944347.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 5760 bytes
SHA-256: c7ffbf63cdcc3af346f695197f7a7b931aea31c980c55b7d80e1774172845420
font_01_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 10656 bytes
SHA-256: d44bf4862b4955d97d32d0a490206d197135c018fc3324c03162bfddd4766d76