Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf34bf766b747db…

MALICIOUS

PDF

63.9 KB Created: 2020-12-30 02:13:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5b5a8a1a9efd4d00b1a128caad1466df SHA-1: e1cc553ccdfb2115fff9188aa2b923389288d31d SHA-256: 8bf34bf766b747dbcd750193c69067da153ec58f6690a281b2b24677e6a8ce48
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 potentially malicious domains, indicating a link farm or phishing attempt. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest a malicious intent to redirect users to external content.

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://trafffe.ru/123?utm_term=evga+x58+sli3+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5fe53b6031126.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/magem_kokagabezeziwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5f9da1ddc3b5d.pdfIn PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/dde13a515f7164f.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/mozotu.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/jixajexob.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/ea6bf36c-4531-4b5c-9583-a87e97ba77c3/1000_canciones_y_acordes_de_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6718560-e269-408c-800e-e9979dc5bf73/may_who_full_movie_subtitle_indonesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d5b2ab-9ab0-4462-a4c2-d0795e4b7dd7/free_online_sunday_school_lessons_for_youth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befe1bdb-1572-4a36-89b2-bdd6c5dde187/light_dependent_reactions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c5679c-c04a-4029-8249-e6d41bf26920/86611073262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0504e9b7-e2e8-47d2-8154-df56902ef20a/89154490817.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_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 5476 bytes
SHA-256: 71473f4cfcf1106a661e879925fcc0d3102165ba54547b39db0ab652d75b6fcc
font_01_sfnt_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 10168 bytes
SHA-256: 02825c9cad6c34ace9c798ed6050ff72351341c6ec1ad8f601d77e24a49936d9

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