Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36feb9646505ddc…

MALICIOUS

PDF

85.4 KB Created: 2021-02-16 05:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a3e83ff925809af744012252e21fbc42 SHA-1: 2f2736f79f3201324e0ca8c2e0a62ca5300308fd SHA-256: a36feb9646505ddc0a6f0c683f22ad42eb4f14c4c7f311412dcda730692149a2
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The embedded URLs and the PDF structure indicate a link farm designed to redirect users to potentially malicious content. The presence of numerous links, many hosted on disposable domains, strongly suggests a phishing or malware distribution attempt.

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 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://maypoin.ru/123?utm_term=extreme+ownership+how+u.s.+navy+seals+lead+and+win+%25282015%2529 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5fe39f57e7f8e.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/Vjgs6lL/happy_wheels_2010.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/hcheB8X/46482018146.pdfIn PDF document text
    • http://luminar3-download.xyz/xefifimosinateneqns.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/operations_management_textbook_online8zdeh.pdfIn PDF document text
    • http://myfavoritesun.xyz/rugomams9yih.pdfIn PDF document text
    • http://axecheat5.xyz/formica_countertop_repair_kityzfs2.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/jbgjJgx/45249300202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fc6f1610ee5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_601627322b54e.pdfIn PDF document text
    • http://1xbets-regs.site/goldenseller_mp3_player_manual0ualp.pdfIn PDF document text
    • http://my-favshoph.online/object_pronouns_worksheetevs32.pdfIn PDF document text
    • http://cherrypimp.online/telecharger_encyclopdie_universalismy46b.pdfIn PDF document text
    • http://arthromedshop.xyz/walkman_visualizer_apk_downloadh2zfh.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/wogikokuzotaxa/postman_extension_for_chrome.pdfIn PDF document text
    • http://kugibujupedo.rf.gd/ejercicios_resueltos_de_limites_1_bachillerato_ccss.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/lavaxujezamafanepadotadir.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/43315127226.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/assertiveness_training_in_psychology.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_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 6112 bytes
SHA-256: cf1c741aa6a421aed3f3829114757a050ec2c31c7b06adb9a577262e9a6f4031
font_01_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 15596 bytes
SHA-256: 8fd86405b4f9bad4aacce5aeac2d206eb4abbe54a69199a98e558183be4aa859

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