Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e15cfec4e5902e…

MALICIOUS

PDF

67.2 KB Created: 2021-02-17 03:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0e36d9eaba3319af27efa4434d949709 SHA-1: b20e0ee2441155a725e3a8480c390b804c7649b8 SHA-256: 81e15cfec4e5902ea3f25f1d676a042b151e5368c0539b7910d7af9f12964aa8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one suspicious URL is present. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious sites or download further payloads.

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+much+money+does+a+cfa+make PDF link annotation
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/fuvifig-lijosixivukit-sunazetixipi-nomafimeg.pdfIn PDF document text
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/mimaxanotaxixuruwil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_5fea15b9d3144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff25f973e8dd.pdfIn PDF document text
    • https://fiferogupinuwa.weebly.com/uploads/1/3/5/3/135306016/bawinunuwawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446273/normal_5fe34796f0b42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_5fd6471c1c398.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/gcoijWy/fetilexuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_600e5abd93ec7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bipepezuwed/swarm_intelligence_kennedy_eberhart.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/clarinet_polka_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/miwotefome.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/25458905865.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/infosys_freshers_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/93041764405.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 5104 bytes
SHA-256: e23234ba34767d7e41b3da39846a7e5b177680a40601e1cc11eab8e8e2aa7c6b
font_01_sfnt_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 9424 bytes
SHA-256: 6e1d19b2f1565c652ea221a13305a860ad4d51168b2aef3df977250ab651d127
font_02_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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