Malicious PDF — malware analysis report

Static analysis result for SHA-256 8557f53ec04b87a6…

MALICIOUS

PDF

73.0 KB Created: 2020-12-05 14:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 116700e98ecb52f2dcf4e61794cf01ee SHA-1: 16e29a45e9254d18de0fde042c7ebb485fd6782f SHA-256: 8557f53ec04b87a64bd8aaa0dd8e8992f308fbd8431c79ebf3986f8ae63da906
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document's primary function appears to be directing users to potentially harmful external sites, which is a common tactic for phishing or malware delivery.

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://traffine.ru/123?utm_term=looking+gorgeous+in+spanish In PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_5fbc35bea1ef8.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/5855783.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/dilapunu.pdfIn PDF document text
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/6191861.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/f821a23b-19e2-4d2d-9176-32b26c595d96/35235773886.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6a5c31452f90b7f0d1139/t/5fc790a7b7521d608a49dcca/1606914215615/vegosamunenazuj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4ca47ab79f442f24277df/t/5fc6d3777995075abdd07892/1606865783608/maryland_technology_education_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6f4e30-14b7-40e2-bd2d-083e0de89dc2/1979_trans_am_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1260f79-2d1a-477d-bb25-60e0171d3d89/53590382691.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1bb67bdb33045eec822d5/t/5fc488273485235c86576c54/1606715433671/bonaxupajexosi.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/lumupebivadanupa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfe5245ca4f7902667367/1606221395097/3885154229.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1175aa879396864096daa/t/5fc36d28173fb5383b0f20dd/1606642985503/komajetusis.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_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 5052 bytes
SHA-256: bd549e5f881f5278e33d84110bbe5082f6b9d10405b05e347f5c15d35e2cb2b7
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 12248 bytes
SHA-256: 964939812898d481ac9fd4dc120d38ffb5989f716c92eb6671d6d070d167fa45
font_02_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 16068 bytes
SHA-256: 687267c9c3db9c7ba5925ba46e702bad05deca9442433a35c4d1c7c9873e4b92

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