Malicious PDF — malware analysis report

Static analysis result for SHA-256 b999532457107b8f…

MALICIOUS

PDF

92.2 KB Created: 2021-02-24 13:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c2c2bdd732fe59824bd8fca67dd74868 SHA-1: 7de688d366c5bc384b5f5d4f4ea564511cbf7446 SHA-256: b999532457107b8f4d82f5c6674ba28e760ed3e2e3c537b158d1a7be42e0248d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, indicative of a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic specifically flags the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to deliver a payload.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=unitypoint+clinic+urgent+care+-+westside+cedar+rapids+ia PDF link annotation
    • https://cdn.sqhk.co/vekosozob/bajeSLj/turn_off_bluetooth_terminal_mac.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/dd2bfd89e.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/mipelogogagi.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/ciehgMU/61485717684.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/iejjhmQ/tekif.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/nawilowujuxuwasur.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/bTijif8/video_chat_app_free_download.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/pebulijegometex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6013438669f32.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/cjgjggH/hasbro_star_wars_studio_fx_app.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/juvetaso/aprendizaje_significativo_constructivismo.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/knowledge_transfer_template_software_project.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/jofawigoz.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/christmas_song_lyrics_quiz_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/blindsight_novel.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/creo_parametric_2._0_free_with_crack.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_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 5456 bytes
SHA-256: 248e5840f232528592472f10d0540856ce70eee2274c0db3e6bfc4c5cdc05c67
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 11544 bytes
SHA-256: 624b4d2f3cadc48270bd01281a248bd5bb4d267d113c65c4ac3b998ded960374
font_02_sfnt_off00014d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D17 16232 bytes
SHA-256: f260341e2deafef282c0cdf6f9547f7c1575836931e00f2cecf0e77490754097

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