Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bc3b50b259485b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-07 12:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 879b69951bf7414cbfd913cb80a385d1 SHA-1: a8ac452b492aea1e55083f130077ce6808b7fa99 SHA-256: c6bc3b50b259485ba6949b827ee6bf36a3757bb6739d139ab4b1a4f203a3da64
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/wix?keyword=horse+drawn+hoe PDF link annotation
    • http://gnoogle.site/follow_up_email_template_to_recruiterwsqkf.pdfIn PDF document text
    • http://bioforce-co.site/manumanonatig15a6.pdfIn PDF document text
    • http://whitecheat.xyz/11686472648dyrrx.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/muxikatujusasennnlm7.pdfIn PDF document text
    • http://maewallace.com/define_attraction_in_psychologypif6g.pdfIn PDF document text
    • http://mapugukabazewu.scienceontheweb.net/hayward_natural_gas_pool_heater_reviews.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/how_to_turn_up_rheem_tankless_water_heater.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/34678605105.pdfIn PDF document text
    • http://7evenrp.ru/zogoladuremonukawoxivl1ny3.pdfIn PDF document text
    • http://koteyarn.moscow/43112721661xd5fq.pdfIn PDF document text
    • http://agent-ritual495.online/words_to_describe_moonlight_sonatabz4jk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luxixeg.epizy.com/90854247803.pdfIn PDF document text
    • http://sekuwomexapa.myartsonline.com/hobart_meat_slicer_model_1612.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_81e1247e92094ec18efdd9535c8a0fb1.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_06eb73811d104b24a1830b0682e5eb1d.pdf?index=trueIn PDF document text
    • http://bakenexiradofo.epizy.com/bitasodigematasegak.pdfIn PDF document text
    • http://sawuliwinupunud.epizy.com/wapijigodajawok.pdfIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_fdf89c03abd041488d187812db6f3e0e.pdf?index=trueIn PDF document text
    • http://kefuvazaleneze.rf.gd/richard_lustig_wife.pdfIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_8ccaf2d4ec1a4666b2c978b9ddcc9075.pdf?index=trueIn PDF document text
    • http://zufosigikirir.epizy.com/12552641344.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/pupon.pdfIn PDF document text
    • http://jatojitax.rf.gd/nikukofudu.pdfIn PDF document text
    • http://satalinev.epizy.com/sunixonejadewej.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_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 4936 bytes
SHA-256: 347a1df70ec6fb66b5623e0d726625c1e8e4847606c66033fa7fcd3f3a4a1b44
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 10792 bytes
SHA-256: 68cbb1c479bd47588f31e5fdcb9c5d7ffde242fe2671432fd4447545ea724bc9

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