Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f57ec8d19c996f0…

MALICIOUS

PDF

38.1 KB Created: 2020-11-02 06:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 63f2b45e25bafb18096571c2d00e10c4 SHA-1: e70b5cea0d45113c926f0710c0c2a110e89465d3 SHA-256: 5f57ec8d19c996f071d187a3fe1823874c1a2e0c5656a3f50dfc02520791f904
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure or link farms. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ggtraff.ru/strik?keyword=proform+995+manual In PDF document text
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/vewunovag_pubalixero_vimegufefigeg.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/2220181.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/aea14f.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/wixamupelinere/technical_analysis_of_stocks_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2441/5382/files/binal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5610/9985/files/66418186400.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/ponderosa_high_school_bell_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4852/5735/files/zezofona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4503/3374/files/9196425266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4289/6554/files/vaneraluzirufevejawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1017/8211/files/mp3_player_app_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2574/3521/files/genetics_vocabulary_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0604/9442/files/corn_flakes_manufacturing_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/1502/0200/files/h_and_m_size_guide_plus.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_off0000583f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x583F 5016 bytes
SHA-256: b920a1cb9088b55ed32a4ac050a28d78622f3253a66dd04b0ba173c90dc05664
font_01_sfnt_off00006937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6937 10208 bytes
SHA-256: 2ef2533f54e36b55f0c9ac99d99b7f1ace8f5eaf8f5d3fc733bd6b10d5ab203d

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