Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6f72a41cc75fb6…

MALICIOUS

PDF

60.9 KB Created: 2020-12-16 21:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a4c7a0942e9b3a75cc309fadeacea99a SHA-1: 977f8824f4df6538a3a0bdf97784208d105ee17b SHA-256: 8b6f72a41cc75fb627259cf1066a57b2da49ba604b2e69bcc21b5f38dfb660a0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link and impersonates the Apple brand to phish for credentials. The embedded URL `https://cctraff.ru/123?utm_term=microeconomics+is+concerned+with` and the link to `https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/fbb67ba.pdf` are identified as malicious or unknown, supporting the phishing and credential theft intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/fbb67ba.pdf.
  • 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://cctraff.ru/123?utm_term=microeconomics+is+concerned+with In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f9265567d011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8a227d89a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5fb536624c4f5.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/fbb67ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f90e5a5838b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457279/normal_5fca9afd4440f.pdfIn PDF document text
    • https://pivebofujeje.weebly.com/uploads/1/3/3/9/133999981/dozewatigipobotesove.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/c2871bf2-c2e4-4867-beb2-66f2396e2bf2/72477948369.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eacbc14dfd36fef1915a/t/5fc46baccb3e0f5771dd64b9/1606708155821/jukexowetatewofepefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05886567-9210-47d2-980e-4815cbbd4211/5241179540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cebdaf5-19c3-4852-a75e-06bbd16e5e4b/user_manual_bmw_x5_2015.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc334329b1ed03538453988/1606628403260/sandwiches_word_whizzle_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93645bd-1faa-4f78-8443-d463263ff451/roxaxumori.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_off0000b67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67E 5032 bytes
SHA-256: d04b70817ea90f8c7f35d41aa7a154fea7369a732c7cab2b79d4895322cd4d85
font_01_sfnt_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 9216 bytes
SHA-256: d9d68ac85d4abaa7ab6d14dfecb5006c6c799af0b2825f4a7701dafd2fa32a6a

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