Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e05fe76bfe625a…

MALICIOUS

PDF

74.9 KB Created: 2021-04-04 15:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d4775e90b78dfb7ac884acac264bec61 SHA-1: 129d7089c6eae06f22e6d08f69061a4152b84241 SHA-256: 77e05fe76bfe625a952fa95a54363c23ea7a566c52b68ed7baafd9d69f9acc36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains URLs that are likely used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=continuous+random+variable+probability+density+function+pdf PDF link annotation
    • https://cdn.sqhk.co/nijegonusas/bSjjWNO/fezemutosiduniwig.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/ihfWeFn/trials_frontier_full_map.pdfIn PDF document text
    • http://kfcrabota.ru/wokolibiwefixer1cn0o.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/XgiEdjc/draw_master_3ds.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/82605840449663xx.pdfIn PDF document text
    • http://xulikugo.iblogger.org/97471181486.pdfIn PDF document text
    • http://wiinorama.website/39401879037pm0r0.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/wilcom_embroidery_studio_e3_crack_wiyeh15.pdfIn PDF document text
    • https://cdn.sqhk.co/pememobuwir/iij6Mjh/49408216658.pdfIn PDF document text
    • http://chebsvet.ru/41386707689765wo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_6036828328a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_6018b6c67dfbf.pdfIn PDF document text
    • http://bibilewixan.iblogger.org/us_army_logo_transparent.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidarepi.epizy.com/belle_2013_free_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/wiliwexoxaninakov.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/woe_is_i_jr.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/nunebupabovato.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_dd80eb1784904cfaba8970531f5d3030.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_a1403433d41f4e0cb4a18b5056832ada.pdf?index=trueIn PDF document text
    • http://tosivasode.epizy.com/10259206214.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/totosivotexifovos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 5508 bytes
SHA-256: 258132475282a803189e1b4722de799f7c5f56d4db77639b51536bc088106ad5
font_01_sfnt_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 11104 bytes
SHA-256: 21a5deb86624a1f4a0787ea076c55b4f605fff6c59f811cae9a8433121c39527
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16064 bytes
SHA-256: 811776956d0b1f89c09bcbfbcda3f036884cdce0b7857604712f2e3f276a6025

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