Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da88603b4d691ab…

MALICIOUS

PDF

80.2 KB Created: 2021-03-25 00:40:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ed6298ff6f266938bb9b0b85193786e1 SHA-1: 6cd3f7b44a98d71bb4c1478e3ccd23e17bf8265a SHA-256: 4da88603b4d691ab823a1e03b7b3ae985100638affdee425e6b0c54b3ad64836
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary malicious link identified is https://druttle.ru/wix?keyword=knights+and+knaves+riddle+answer, which is likely used to redirect users to a phishing or malware distribution site. The ClamAV detection and ML classifier further support the malicious nature of this document.

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://druttle.ru/wix?keyword=knights+and+knaves+riddle+answer PDF link annotation
    • https://cdn.sqhk.co/temirikuji/btghQdo/bright_memory_mobile_uptodown.pdfIn PDF document text
    • http://difodalutovirub.iblogger.org/95656104261.pdfIn PDF document text
    • https://zajawegunane.weebly.com/uploads/1/3/4/3/134332092/xikixenezezadinur.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/3332008.pdfIn PDF document text
    • https://cdn.sqhk.co/ritelatefoxa/hfjbgW3/best_online_boutiques_for_formal_dresses.pdfIn PDF document text
    • https://pepuxopotu.weebly.com/uploads/1/3/5/3/135390253/mupor_xozogitukilomul_lerajeligi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzibepunu.rf.gd/27567552261.pdfIn PDF document text
    • http://luzadewo.epizy.com/83963391248.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/44881445328.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/spartacus_full_series_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/ancient_egypt_world_history_crash_course_4.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/getolatezelipamasusuwukep.pdfIn PDF document text
    • http://belunovozexuse.rf.gd/darnassus_exalted_guide_classic.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/gebobikutarufakatiw.pdfIn PDF document text
    • http://rapodipowunifo.epizy.com/nedomibugugetizapunato.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/biwaxavexifuxobemigifigoz.pdfIn PDF document text
    • http://timofojitowamut.epizy.com/bapuvawibeki.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_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 5272 bytes
SHA-256: da9661f0af55ea0305298ed393e4163908603211fa5bed0b22d58ef29a00fc18
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 11636 bytes
SHA-256: eae160bf563a4dde09f7b63e0e7dbcdeddf3b70cd03a030f3fe49803e597af03

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