Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77c9e56d9dcc3c8…

MALICIOUS

PDF

68.0 KB Created: 2021-03-01 10:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3488ce39a7e609c046465b0ea4dced68 SHA-1: e947566befe905e6733bfb4be41dd0341be5011d SHA-256: f77c9e56d9dcc3c8c89bd050f9f7636307c4fa44906956e86809f477e6942c21
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This URL is presented in a context that mimics a search result for 'Bose acoustimass 10 series iv subwoofer repair', suggesting a phishing or credential harvesting attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/123?utm_term=bose+acoustimass+10+series+iv+subwoofer+repair In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_5fe98f0fad133.pdfIn PDF document text
    • http://bonus332.site/tres_veces_tu_pelicula_completa_en_espaol_latino_online_gratis_hdry7zo.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/rihTMeM/recipe_applesauce_cake_caramel_icing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fd2c91a2c1ec.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/CYGjfgh/repexasopuxamozejepo.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/3303608414.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/redegelesibif/zazewetafixevositoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/zagoreduderes.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/71099940456.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/film_alif_lam_mim_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/activated_carbon_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/business_plan_template_simple.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/rezujufaxud.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_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 5664 bytes
SHA-256: c87b1076ee613a61877e5194d3ed7a9a298eba859f0548c24a5c8b5de31cce90
font_01_sfnt_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 10944 bytes
SHA-256: 1e1a5787091b4daaade3005050f9a7457064379ceefa129f995d61ebe728f357

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