Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad50fd16500c787…

MALICIOUS

PDF

71.5 KB Created: 2021-02-06 09:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 420137464c55f503cfe7de2e7b1cdd24 SHA-1: 2395151af36e1324ca1400152d2e29203f070f77 SHA-256: cad50fd16500c787a631820a15513cf4b4641509b118bcf1ae0b6bd89b09a8c8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection strategy. The presence of ClamAV detection and ML flagging indicates malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to direct users to potentially harmful external sites.

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://maypoin.ru/123?utm_term=harry+potter+height+reddit PDF link annotation
    • http://goodsfor.life/deer_hunters_moon_guide_2018_freek6l1z.pdfIn PDF document text
    • https://wotilawijuv.weebly.com/uploads/1/3/4/8/134852567/basejik.pdfIn PDF document text
    • http://kedusigodozop.22web.org/weather_report_maigalganj_up.pdfIn PDF document text
    • http://gloslides.com/25535611091csa7c.pdfIn PDF document text
    • http://orbitan.fun/furetulitajogogobiwi060el.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371524/normal_5fe2cd9ec6d3f.pdfIn PDF document text
    • http://naderuromopuru.22web.org/76692244499.pdfIn PDF document text
    • http://lnstagrambusiness.com/gipajukudinax4kf6z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefobimulekojuw.epizy.com/mumaboki.pdfIn PDF document text
    • http://vunibem.epizy.com/transamerica_life_insurance_underwriting_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/letter_x_worksheets_for_toddlers.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/violin_christmas_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/basurosuwojakaxusezazif.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/53347056927.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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 5072 bytes
SHA-256: 766004059138d9b1ab7f7a844144cc0558e4da7606daa231ca8bbc0dd0351eb5
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 10972 bytes
SHA-256: e89b68116ea9a6b256e34038cb708cca566364c25cd6d95ed11d4fca1f7a308f

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