Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a873abaf5ac76ca…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 10:15:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f9355e3936a5b739266b2aa0f8f9ed88 SHA-1: 0b957e1c94e8518dccdf649fc8954bf1ed2a6f49 SHA-256: 2a873abaf5ac76caf320ac0a7e92b1c70e51e36dfdd3fd6bebed43b7b0a64dbf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, https://vilenefex.ru/wix?keyword=crash+bandicoot+2+trophy+guide, is directly associated with the document's content, suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/wix?keyword=crash+bandicoot+2+trophy+guide PDF link annotation
    • https://cdn.sqhk.co/fopikudapom/kWaPEhf/word_scramble_solver.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/hitchhikers_guide_to_the_galaxy_chapter_29_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/N7aw8ij/management_consulting_firms_near_me.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/mudatudafobenabawofuled.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/weathering_with_you_eng_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/sizesavi.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/child_protection_policy_template_ireland_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/khao_lak_travel_guide_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/67521366169.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/recruitment_consultant_cv_template.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_1848355dc0634fdf8af925cc28a9ada0.pdf?index=trueIn PDF document text
    • http://jomupaz.myartsonline.com/sentinel_gun_safe_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/broadway_ts_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/51238315584.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_4078a359b96e475e9a4584b051c5bbfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitozi/frp_bypass_apk_galaxy_s8.pdfIn PDF document text
    • http://widusop.atwebpages.com/10498166438.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/samsung_android_9_wps.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/drivers_ed_online_final_exam_answers.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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 5584 bytes
SHA-256: f1ce951faea75e39d5f8c05cb90249c86b530878376e1c52836d3a5ba2d71e27
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 10984 bytes
SHA-256: 19cb2e1305b95c665cfa3d323ff97706882a10156d5efc1c60c2e15fd748450c

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