Malicious PDF — malware analysis report

Static analysis result for SHA-256 537b067c52c230f4…

MALICIOUS

PDF

78.1 KB Created: 2021-03-08 00:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9761916a0d5455e0059225bc748d987a SHA-1: ce2afcaef0eef6e4ac7bd512050d0673c022f27b SHA-256: 537b067c52c230f488d5c2c99720ed1fb841e6fcf10f2d7b4fc5a64785a450d1
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. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. One of the primary URLs, https://gimoguvi.ru/strik?utm_term=basic+math+worksheets+for+kindergarten, is associated with a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://gimoguvi.ru/strik?utm_term=basic+math+worksheets+for+kindergarten PDF link annotation
    • http://legko.travel/37348378861pk7dk.pdfIn PDF document text
    • http://brumbum2.xyz/dark_souls_3_dlc_price_xbox_onek95li.pdfIn PDF document text
    • http://sberhome.ru/nipopamixenifeperibenon9ljwk.pdfIn PDF document text
    • http://onlinetiser.website/anatomie_de_l_articulation_du_coude5tlyq.pdfIn PDF document text
    • http://creditreportus.info/vintage_timex_indiglo_digital_watch3lfit.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/sotemasokidedufezezibo3.pdfIn PDF document text
    • http://evatopshop.xyz/xuvapurssk4s.pdfIn PDF document text
    • http://cosmostil.top/modern_sofa_set_designs_for_living_room03h3v.pdfIn PDF document text
    • http://scoretdho.best/thales_prc-148_batteryw3p3y.pdfIn PDF document text
    • http://file-id.ru/dopikizalasopj72hl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_78da26f0c9d347f79442a613f80c7d08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e84c4ad-fcbc-422f-aa6b-ae50c9704a3c/how_to_scan_multiple_pages_canon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc15532a-28ab-4508-b9bb-5ac6d888531b/jofigiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2308c60-ace9-43c6-a9e3-636a9fbe15d3/histria_do_caf_no_brasil_resumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2045f1f-0af2-4ceb-9107-2a217ccc6611/witebuluzexarunigifelokas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc47b38-7e7e-4be1-ab15-983cce32e0e2/how_to_avail_solo_parent_id.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_56a654d6f0224f908e6eb4b277758fda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9084b5b-6f3c-4a5b-bd8e-2d9452af4db7/how_to_write_address_for_international_mail_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67df3b94-93fd-4205-8afd-2cf132787cc3/59688287524.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_8e3f387070c6487d80ebd809b85dae09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e54a174-05ac-4d8f-aa2c-a800a50c9eb2/demakotawazetob.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_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 5608 bytes
SHA-256: 93f87d58de29e1cf4f4691cfebb0f926575faaec9cec56c8ee24e3b6ce31e13c
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 10752 bytes
SHA-256: 63b678ca89623c5548faf295e682befc28ce7f48384148a40e8916c847dc9cc2