Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce65ad17c1fab8f…

MALICIOUS

PDF

77.9 KB Created: 2021-04-04 03:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c0e29eb7dc6287a040f5165dac833f4 SHA-1: b63ea4070db2d47768e2487972b8e89ec7e85ad1 SHA-256: 4ce65ad17c1fab8fb247750547cce20ca4ed0fd60f2b7d7de712b0169cc92175
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to direct users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to external resources, potentially for credential harvesting or further infection.

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://zajinet.ru/strik?utm_term=ariens+824+snowblower+for+sale PDF link annotation
    • http://nicepics.xyz/socket_programming_in_c_windows_tutorialbr0zc.pdfIn PDF document text
    • https://nuxofenaf.weebly.com/uploads/1/3/5/3/135306259/ae91beef75b868a.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/washington_redskins_record_by_season.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/jixazuropibodudisosi.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/16681535599.pdfIn PDF document text
    • http://znalomstvavip.site/reset_braava_380tbinx3.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/joguj.pdfIn PDF document text
    • https://kigokevorusom.weebly.com/uploads/1/3/4/7/134709893/db00595cc0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_0092ff33d3554b06b9d5d1efe08b02d6.pdf?index=trueIn PDF document text
    • http://fabevax.myartsonline.com/teoryang_behaviorist.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_5d9be7b438114b99af4dedfd25bbf401.pdf?index=trueIn PDF document text
    • http://vasinazovuxe.rf.gd/infamous_2_trophy_guide.pdfIn PDF document text
    • http://wewefaxekedafoz.epizy.com/lagu_benzooloo_pisau_cukur.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/acls_study_guide_free.pdfIn PDF document text
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_e9652d1d1c9440be935c885c22a3b38d.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_8a4e89bebf1d4bb084fdf55a3457a646.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_10b77e1ab94f49659de0ca8eeccb2388.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_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 5396 bytes
SHA-256: 542eb898262287f862d84d21816cb15fb7a48b0545424fb17947b562187dd684
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10732 bytes
SHA-256: 97d6422820aa5a4f1bfc392160f573c8dcad2ae1dd10fb7adc0567ff0e90ba69

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