Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c50b302005c66fb…

MALICIOUS

PDF

81.3 KB Created: 2021-03-10 19:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 270a1a74d639fe888ae9cffea88bc2d4 SHA-1: 4d784768570d99ed939c62420a1e1b87e6f6a164 SHA-256: 7c50b302005c66fbf97a31b26b3d490d1598d3862eeefff50f893cd1965030d3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with several pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=2020+senior+shirts+toilet+paper PDF link annotation
    • http://parrrtner.xyz/character_reference_template_for_family_courtdltjm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_5fe9e43de3618.pdfIn PDF document text
    • http://demask.fun/coca_cola_sponsorship_request_pakistanvjf07.pdfIn PDF document text
    • http://metalllift.ru/dopowenopakigofesudufurizo4o4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_60357d53acd53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421944/normal_6002f5638c45f.pdfIn PDF document text
    • http://vitolebizojigok.22web.org/60024591731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_6045089419246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465015/normal_5ff384a3dc70b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pubopelej/32858568403.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_8b4af346e2ba4d64947070354382405b.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_0ed536ab16534a8dba45a4c81585ffb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guxosa/math_worksheets_grade_4_adding_fractions.pdfIn PDF document text
    • http://gugafusewetesix.epizy.com/vubotifemixugerogololidez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685379de-d70e-423b-b0f3-fb890bf7ab54/arguing_about_literature_a_guide_and_reader_3rd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/warriors_fire_and_ice_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e04c9b-4615-4f0d-bcfb-97195282780f/74227955685.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_73e8cb9e7cf84681b8025955c03f138b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf40480-32ff-40c8-a546-09924f1d7c3c/what_is_linking_words_in_english_grammar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d3b0a8-9ac1-4ae0-9ed7-81030710fc9d/line_6_helix_hx_stomp_multi_effects_processor__amp_modeller.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_ae02f5359f394b96a6f93cf663386b9c.pdf?index=trueIn PDF document text
    • http://pubuwaxofivu.epizy.com/42035225480.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_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 5084 bytes
SHA-256: 2e2c9bf8cf2e46171fff6d882e4aba07d855be47dcc2c2bb8bc20c442b6eaecd
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 10840 bytes
SHA-256: e549099fd4c09c92fcf1dc69c10d8b7b132494f3da3d604f706e5c70ffb86490

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