Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2a3053fef4e393…

MALICIOUS

PDF

81.1 KB Created: 2021-04-02 22:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0270cef641e81a81290184cdf5e7201c SHA-1: d7761d4241677e54c477f81b858da7f6dd44fc0f SHA-256: 8f2a3053fef4e393d122b30a60e39eb03d43fcbb8e003cb4ad012b47049ff91f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=the+power+elite+c+wright+mills+pdf PDF link annotation
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/xinoba.pdfIn PDF document text
    • https://doziverilobeku.weebly.com/uploads/1/3/2/6/132695566/8390221.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/5879271.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/b2f5c851e9e4a6.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/rapelivumuxek.pdfIn PDF document text
    • http://edarudost.online/mumokidikudefitenutqlu.pdfIn PDF document text
    • https://nubugudapo.weebly.com/uploads/1/3/2/8/132814946/gakute_jokevawebivan_wedafefo.pdfIn PDF document text
    • https://rasiporimi.weebly.com/uploads/1/3/4/6/134614798/8884753.pdfIn PDF document text
    • http://begemotiks.fun/les_diffrents_complments_circonstaasurm.pdfIn PDF document text
    • https://rujuramokukavet.weebly.com/uploads/1/3/0/7/130739146/3376185.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/a31b9bfb25.pdfIn PDF document text
    • http://zapazereti.22web.org/wewefajuzefuvedaro.pdfIn PDF document text
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/27f595e1cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_6f5da6384f1b4d6a90ca44f1fa687381.pdf?index=trueIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_cbc90343342f4a2aa96ec86d81f27e53.pdf?index=trueIn PDF document text
    • http://fobegakolu.epizy.com/jubajajenulajizelemul.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_b0d38d405fd44f6a900abdfd92c33da6.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_6141ed38f57e4bc7b1da4090e0233a4e.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_34461ab12da34a43a3522a46567c252d.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_cff3a35a5cb6432d9fc7cc9bbb0da8b9.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_0a506917362d4fc199ef8c45db747260.pdf?index=trueIn PDF document text
    • http://wepolaxozerev.epizy.com/john_dewey_school_tuition_fee_philippines.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_331d4acdb64f492caccc3bbb035faccd.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_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 5400 bytes
SHA-256: 5f4822b07018dbcebd514ffe61ef83fa7cf581606f446be259d26d516b0055ec
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 11428 bytes
SHA-256: 2495c98afd33bfc1562078d5ce013a9391916a4228d3f97e74ad6a2fad51c0a6

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