Malicious PDF — malware analysis report

Static analysis result for SHA-256 8914e814761777a6…

MALICIOUS

PDF

81.1 KB Created: 2021-02-09 11:47:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 17fdabf5e8e9f9a053fd0739f4bb9d20 SHA-1: bbe2f4fed702401ddaa668d7dfa23907d29b8912 SHA-256: 8914e814761777a6a5900240b831d43075518e4c36631ecdf58175c03df85a56
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a critical finding of a redirector link to 'crophysi.ru' and a large link farm hosted on 'weebly.com'. The document body, though heavily obfuscated, appears to reference 'Riverside health club app', suggesting a lure. The presence of embedded URLs and the detection by ClamAV as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

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/123?utm_term=riverside+health+club+app In PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/sipalo.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/najudekegevirulidkf36z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501791/normal_602013eb72524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_6010c9591d545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5fe41086ebe8a.pdfIn PDF document text
    • http://devlp.design/gagavosasipesemelah3wlb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5ffab58655f4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6020ba83ca045.pdfIn PDF document text
    • http://zanartcc.net/best_buy_old_brooklyn_ohioismlg.pdfIn PDF document text
    • http://cocobeautybar.ca/48334062941b9k83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414688/normal_5fcef548454d1.pdfIn PDF document text
    • https://gekafokolasiga.weebly.com/uploads/1/3/1/3/131384301/6746631.pdfIn PDF document text
    • https://cdn.sqhk.co/fefuxumito/1kihhgi/1349952565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_600124732ff92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415073/normal_5fe40f3ddcd50.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/a4bba3508e68c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459058/normal_5fcd9d23054a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424689/normal_60120e4bedd85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448538/normal_5ff6af8e9a818.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
    • 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_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 5032 bytes
SHA-256: b2e2c8702b72a057fdc21d4a24bc4f0d0683dc48c4b4471cff87b80f73487f8d
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10820 bytes
SHA-256: 66b5516a24c9cca7f54eafdfe3e5b0d4246b4204cf7323bc3d1ef5e9d366d5be
font_02_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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