Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2215ebf0894a0b4…

MALICIOUS

PDF

78.5 KB Created: 2021-03-16 07:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1804850f432df6124c4d7c2980ec04 SHA-1: 37b54a58fd941729684283ba64d8aceda0362c61 SHA-256: d2215ebf0894a0b4a1ad6c8e3535ff3be8f65cda5a326bcf9452a99886e6be31
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or redirection scheme. The ML classifier strongly identified this PDF as malicious, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious intent through numerous low-reputation links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://kuzutuzo.ru/strik?utm_term=estudios+b%25C3%25ADblicos+para+mujeres+dorcas
    • http://dajutim.22web.org/49238814471.pdf
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/86712.pdf
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/2796058.pdf
    • http://sowipilarow.mygamesonline.org/renunemusukabes.pdf
    • http://lexaxak.mywebcommunity.org/dazidesijamazizakutetot.pdf
    • https://wemakevarovafa.weebly.com/uploads/1/3/4/6/134636541/sidetiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://limixumijegaf.epizy.com/kazodu.pdf
    • https://uploads.strikinglycdn.com/files/f1c360cd-104b-4bf6-98ad-d69705ad68f9/great_lakes_data_science_and_business_analytics_course.pdf
    • http://wizigipixe.atwebpages.com/jewevipudifivelipixur.pdf
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_03d8ac748cdc4efe85a14b5cd64cc29a.pdf?index=true
    • http://nedizilunok.myartsonline.com/nugipevavawufaz.pdf
    • http://palumigokaximeg.epizy.com/70688323262.pdf
    • http://jinegudizoropi.rf.gd/repatujogebakafadejanapu.pdf
    • https://uploads.strikinglycdn.com/files/aa5213cf-5fe9-4fed-9096-98b5ff93f613/30303853460.pdf
    • https://uploads.strikinglycdn.com/files/802af4e1-049f-4ca4-99dd-bb2762cd49dd/how_to_deal_with_spouse_with_terminal_cancer.pdf
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_dd39a50df20943a98611cade537a83f7.pdf?index=true
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_f661a7a6bf9f4780913bde59a73b8d40.pdf?index=true
    • http://gototura.myartsonline.com/samuel_beckett_bridge_at_night.pdf
    • https://uploads.strikinglycdn.com/files/1cb2c653-6a32-45e8-8dcb-2aa53602fff3/backpack_literature_6th_edition_amazon.pdf
    • http://wuragumok.atwebpages.com/rolemisoz.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_off0000f103.bin
e501befcfb3f2b22058054f5b2000e3d462c7ffe3528e3499d35e8acb4412a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 5444 bytes
font_01_sfnt_off00010376.bin
7ea1d46d5795edb8603a54b2b0a1fb2c465f038c1d1fec8ed29d77763a0130e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 12292 bytes

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