Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbed65a1b1bd5aa…

MALICIOUS

PDF

71.9 KB Created: 2021-02-23 02:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 31fd94285d880a253bba36e2ce24268c SHA-1: 5d9498fb4fcf3e2c6bf2ffcc0fb4524e95379ac1 SHA-256: ffbed65a1b1bd5aa274dc33725ba89641f7dcc332432ac34889e870fb9578af5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a potential phishing lure related to a 'Samsung soundbar'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting a malicious intent to distribute or redirect. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing attempt or a downloader for a second-stage payload.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=ur5u-8780l-twm+samsung+soundbar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404741/normal_601379bfab0a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_602f276cb162c.pdfIn PDF document text
    • http://mysteps.online/current_issues_and_enduring_questionssx1nb.pdfIn PDF document text
    • http://negozio50sconto.info/botasijotikawosora96co.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5ff5cbc639ba2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5fefbe279978b.pdfIn PDF document text
    • http://arm-watch1.club/58305334053dbal.pdfIn PDF document text
    • http://samelike.site/interactive_lapbook_templatesywfbp.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/pobisumenet.pdfIn PDF document text
    • https://xuvupidorok.weebly.com/uploads/1/3/1/4/131407629/7ea2581d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_60255937a0846.pdfIn PDF document text
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/4906076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/fraction_word_problems_5th_grade_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/xikabatijerilen.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_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 5940 bytes
SHA-256: e59843ad233ac33aac716f5c327131ededbad94c64243c00de3634860ed329c4
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 10808 bytes
SHA-256: e275d65563cdfca1091e6b09d4dad625c33c4660a13a217d9c1d7a401708da38

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