Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe50bf1f93e989b…

MALICIOUS

PDF

74.5 KB Created: 2021-03-14 00:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0b847454126d32456daf0d4e781dc227 SHA-1: 1060fe552ab8de31bff825f3f0e86ca7df43180e SHA-256: fbe50bf1f93e989b09decb658615ffa6408fe31fe9f25fc527e07aec4296d25a
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 0.9997

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=how+to+reset+my+linksys+wireless+extender PDF link annotation
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/9db434b107.pdfIn PDF document text
    • https://redobikarus.weebly.com/uploads/1/3/5/3/135396910/a4d08.pdfIn PDF document text
    • http://beautysss.site/microsoft_excel_2013_free_download_for_windows_7_64_bitnag84.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/eljigju/vidiq_app_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/Zhdjggi/turbo_racing_3d_apk_mod_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/h9EKY2b/xuxevijurapaxiw.pdfIn PDF document text
    • http://medazuxa.mywebcommunity.org/soundlogic_xt_user_guide.pdfIn PDF document text
    • http://bigpleasure.ru/68106585337o7ycu.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/7wib124/baixar_facebook_lite_messenger_pc.pdfIn PDF document text
    • https://fitarerak.weebly.com/uploads/1/3/5/3/135313257/f6109f7955198a9.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/050d5c5c8bf2393.pdfIn PDF document text
    • https://teguvazotumeli.weebly.com/uploads/1/3/4/0/134041540/fiteter.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/ifygghi/51213346046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidalagep.myartsonline.com/phonics_lesson_plans_for_preschool.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_d7d1235015e64716a9695cce6c3acb3f.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_275d8c38ef1b40d6be369b034019f0f5.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_4875f883e43f4b2483dcf3fea0820759.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/mokukikazegugusulugove.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_fb1af286101348d68378723557ef6f2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/67968492145.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/ukulele_chords_lady_gaga_million_reasons.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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 5048 bytes
SHA-256: f84f497810ec46f5a650dd011c1b003e422107ed5059712e5a6e6e444d781bfd
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 11032 bytes
SHA-256: 8e0555dbfd554c75a16b9d7c76c42e873c1b2da5243b98cc9437fa582d0d8837

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