Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c30771abfbc097e…

MALICIOUS

PDF

75.7 KB Created: 2021-05-27 06:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a0bea390b904337f887582bed83d6c95 SHA-1: 271fc58bec3e8a42ba20b84f352ef751df8e9ea5 SHA-256: 0c30771abfbc097e321ba2f3562f315273fea5bfa4b8534951efb7b23445d088
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 point to other PDFs, suggesting a link farm designed to manipulate search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=how+to+file+for+unemployment+part+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366661/normal_60266f0bc036a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459481/normal_5ff6a6810c532.pdfIn PDF document text
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/8209104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_6069e3e5ed3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_604135448eab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_604cc31127359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_602c35b454247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_606793994018b.pdfIn PDF document text
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/36c0078d74dd200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_6014ce053fa2a.pdfIn PDF document text
    • https://bogigevaruzo.weebly.com/uploads/1/3/4/4/134435623/mazel-peredufaje-kowolimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454822/normal_5ff27982586c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_60235f30c19ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5ff3e1efe0cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_603da6f0b39ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391896/normal_5fdca6cdd1fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476766/normal_601d703b4a413.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/88b55b13-03bd-4eb5-a0ef-81503a221dc5/71349023572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea316b0-eedf-402c-adb8-33c9db75cf8a/rojamunil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a5a82f-0bbf-4cd0-99db-ba8fe5c08a48/rusefolojubazebiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bbbf504-3b00-4b1d-9345-970cce8f5010/fibatabusuku.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_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 5024 bytes
SHA-256: 03ace0dae7cc1b52b1dc73db46640e1e8186a7e33fba57725a6abe3ec7573f08
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10680 bytes
SHA-256: f1c430785351fb0c644bff4952207df5f104f325c147cf18e578d79e3ef371a1

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