Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e84623db510bde…

MALICIOUS

PDF

66.3 KB Created: 2021-03-15 01:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 98512064de21fd8b01352ff7818c1367 SHA-1: 1d1aed0ed91358d9331599aa3b3020b7083cf469 SHA-256: 31e84623db510bde7444008dd59bca5de6d3eef9b7d17e3d64cc46580c8fa377
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, specifically for containing a redirector link to known malicious infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful content, likely for phishing or spam distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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/wix?keyword=nastran+quick+reference+guide In PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/3066189.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/Qjfhfjj/business_analysis_body_of_knowledge_guide.pdfIn PDF document text
    • https://fuluposusiziz.weebly.com/uploads/1/3/5/3/135321682/lakuge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_6020902f667d4.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/04E56ib/amazon_a_to_z_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5fcf1c1d431c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_6041b529d7df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_601d2cdf3ccd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489045/normal_60136e2dbc45e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeda708c-7d4f-458b-b26a-f6a39320d422/what_canvas_is_best_for_acrylic_paint.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/joduneriwevegujaledez.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/trace_alphabet_letters_worksheet_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae71e4d-74cb-4457-9355-a7809db9c1e8/black_max_21_160cc_self-propelled_mower_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/mivisosedorukol.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/irregular_plural_worksheets_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/90229893932.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_off0000c775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC775 5316 bytes
SHA-256: 648b443439417427bb1a7a0d0310d359866fad1df06d8d58424c5ed0e5fe57fa
font_01_sfnt_off0000d99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 10068 bytes
SHA-256: 1c2b88b7305a77c7ae388a5d76b1580b185360574fad3e2855f791e7dc9e0b1a

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