Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f753574f11d0d6…

MALICIOUS

PDF

82.6 KB Created: 2021-03-29 06:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 923fed397766870fe5e9b8340f67a96e SHA-1: 9068c841999ce187074c233b57ad615f1603bef1 SHA-256: 51f753574f11d0d6d1874fb15b4a2bf6c24619624ec965a58543a350a75f5430
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The primary URL, 'https://maypoin.ru/wix?keyword=secondary+math+1+module+4+answer+key+4.8', is likely a lure to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/wix?keyword=secondary+math+1+module+4+answer+key+4.8 PDF link annotation
    • http://allerop.xyz/43394016858m0uj.pdfIn PDF document text
    • http://artrosil.xyz/thetford_c400_cassette_toilet_seal_replacementzcxy7.pdfIn PDF document text
    • http://deromgroup.com/9622416495611uly.pdfIn PDF document text
    • http://desokore.medianewsonline.com/pdf_editor_insert_pages_online.pdfIn PDF document text
    • http://zebolalifitu.22web.org/equipment_maintenance_template_excel.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/rudram_chamakam_download.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/86365571703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_aa6b337802684a00a5db90cd69e2d4e0.pdf?index=trueIn PDF document text
    • http://jemowefodidalo.rf.gd/happy_birthday_sheet_music_piano_easy.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/watetujugixesin.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_5d1f679b47624f64b8f62815cdfdc9f0.pdf?index=trueIn PDF document text
    • http://nanesipub.rf.gd/xekidajepabex.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/65441206926.pdfIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_0ba1eeafdce54e468b8899778146caca.pdf?index=trueIn PDF document text
    • http://zofududa.rf.gd/self_certification_form_example.pdfIn PDF document text
    • http://giwolexuki.rf.gd/wheels_up_airline_business_plan_development.pdfIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_f3b311028232421fb579dc4f4705c22a.pdf?index=trueIn PDF document text
    • http://vivazuriperulus.epizy.com/charitable_trust_registration_form_in_kerala.pdfIn PDF document text
    • http://jegigas.epizy.com/86706656718.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_079dce2b57dc4dccbef208f83eebedde.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_c265addc6da04eb8930ca0e47120a010.pdf?index=trueIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_fde150e04853494aab5f4540d76cd221.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_a923c73d5cf544a7852c0365a49bdffe.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_81990833490a425ca5b1411777e89ae9.pdf?index=trueIn PDF document text
    • http://laxozoz.epizy.com/what_to_look_for_in_a_used_car_before_buying.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_off0000f5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 5740 bytes
SHA-256: 753c9b6c2e0ff98d1a603f067226cbf1631e7e7670ca422b22a183a16c944a5a
font_01_sfnt_off00010965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 10864 bytes
SHA-256: 909d21cdf769151692ccbb28e80d455ac1bda01370860cdd6d4a1fe8733416e0
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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