Malicious PDF — malware analysis report

Static analysis result for SHA-256 21caee8f2427c5c2…

MALICIOUS

PDF

72.4 KB Created: 2021-03-05 14:27:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b188ac0d0d5aada6b1379b7db15a15b5 SHA-1: 66769ddc6f4174c9e16910346a143b7c2e573c9a SHA-256: 21caee8f2427c5c24a1e04ff554d29ae3ce72654ef041fa1e40c683271cdfb09
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. The embedded content, though heavily obfuscated, appears to be related to specifications, likely a lure to encourage clicks on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=1995+polaris+xplorer+400+specs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501509/normal_603b795f5e4e8.pdfIn PDF document text
    • https://zelunetuba.weebly.com/uploads/1/3/1/1/131163782/zigimap_wepezozi_zubidajizavol.pdfIn PDF document text
    • http://inscarusa.info/ff14_heavensward_anima_weapon_guidezaa9a.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafaveju/ibghYji/6591554270.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/lilebisolelud.pdfIn PDF document text
    • http://my-favshopc.online/who_makes_trane_mini_splitsajvt9.pdfIn PDF document text
    • http://teagreen.space/video_call_on_samsung_s20_plusixbbm.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/xinovapi.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/3So1hiJ/19765988501.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuwudofal/hiDdTAy/build_rite_construction_inc.pdfIn PDF document text
    • http://otomail.business/20978196774en5l4.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/cotEij1/88036869557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491412/normal_5ff1405a466f8.pdfIn PDF document text
    • http://sarhello.online/biodiversity_conservation_act_2020m49qm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_addca3a2d26049fbbce8c83f6e3163f7.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_49f6db16a2c144068ed91a643acb8b6f.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_2e59649bdeef4dbc9767ffb9be6f8e9a.pdf?index=trueIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_a22bebece8574ba0b18aea35e27da44f.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_cbcf51c98d6e40cebffc52df182aa494.pdf?index=trueIn 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_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 5460 bytes
SHA-256: 63aebb9dd6ec9b21361dc8dac7aec732760054c8964da096cac7b9e3a5e05da6
font_01_sfnt_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 14060 bytes
SHA-256: fd2ab5464045e74e6992bcfd7d4796bb7d554f8be06ac8216cb97406d7bf0d22

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