Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a3e6caa01c4429…

MALICIOUS

PDF

77.6 KB Created: 2021-02-02 12:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 26381d16e5bd4e83952101138d7e5e83 SHA-1: 9f1348807ce013eb2b93d4ebf7d786c01bf58fd2 SHA-256: 35a3e6caa01c44292dc3ff0ab0f6ad6c6d2618ff0a8dff1fc567993cc033b94f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document is designed to redirect users to potentially harmful sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=free++font+book+antiqua+bold PDF link annotation
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/nojuxolor-juwenekosif-dizekiki-nupisasiva.pdfIn PDF document text
    • http://geleostone.online/gajefunoxoretzrave.pdfIn PDF document text
    • http://datekal.22web.org/report_burst_water_pipe_durban.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/dumate_jezamo_tijixej.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/nozesavok_jodigagobolatik_sejafedip_sipumaxi.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/simple_budget_template_for_an_event.pdfIn PDF document text
    • http://rezotu.xyz/string_is_wrapped_around_a_uniform_cylinder57ykw.pdfIn PDF document text
    • http://wssummer.space/path_of_exile_the_baron6i8fa.pdfIn PDF document text
    • https://ravemazezaj.weebly.com/uploads/1/3/4/8/134885195/jixazimana-kejavoxe-fuxux.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/244da9.pdfIn PDF document text
    • http://shoop-fo.ru/80s_hit_singles_ukqdzhj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://serinuzosazojup.epizy.com/19696417977.pdfIn PDF document text
    • http://siberasule.rf.gd/consumer_reports_best_midsize_suv_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/contouring_guidelines_cervical_cancer.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/statistical_test_of_significance.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/21083369154.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/lapewawireserulemamib.pdfIn PDF document text
    • http://xifedesekelogu.epizy.com/greystones_guide_contact.pdfIn PDF document text
    • http://gatoruvizuzil.epizy.com/angles_on_parallel_lines_worksheet_tes.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/carbohydrates_and_classification.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5008 bytes
SHA-256: fdbe3e41cb304d79ab429a381b6844a5c5474c191f301576d7614aadf19dc346
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 10284 bytes
SHA-256: 7aa78c464508d30127dd5a5b99739e4ecf5c0adc63599375554e2e4f3b0a8131

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