Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeb7936028579bc…

MALICIOUS

PDF

75.3 KB Created: 2021-04-09 02:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c1610fe84da52dde2740a71e76ed6710 SHA-1: b27384b98fc420c32b903a1a9396767fee2d47bf SHA-256: caeb7936028579bc6bb65e3e647908851300a7b38a827ae00b8dbec4cc4832fd
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'easy piano music books for beginners' and the wkhtmltopdf application, likely serving as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=easy+piano+music+books+for+beginners PDF link annotation
    • https://koduvorubosu.weebly.com/uploads/1/3/4/7/134719400/69abcf66c7a9883.pdfIn PDF document text
    • https://vonewujin.weebly.com/uploads/1/3/1/3/131380349/82bfae2b80954.pdfIn PDF document text
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/6989573.pdfIn PDF document text
    • http://recepty-dd.info/77531466511sn62l.pdfIn PDF document text
    • http://opticsystem.website/ofsted_report_beaumont_school_st_albanstzhcg.pdfIn PDF document text
    • https://cdn.sqhk.co/dorodidur/jf0Pl2f/38433788237.pdfIn PDF document text
    • https://dajikunizitawis.weebly.com/uploads/1/3/1/1/131163857/4659ddfc25a83.pdfIn PDF document text
    • https://xitirume.weebly.com/uploads/1/3/4/3/134392652/25123d5395.pdfIn PDF document text
    • https://napuraviseso.weebly.com/uploads/1/3/4/3/134322211/8229549.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/9345250.pdfIn PDF document text
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/bazoloxato.pdfIn PDF document text
    • https://fasosizive.weebly.com/uploads/1/3/4/3/134351581/fcbd68b040a06.pdfIn PDF document text
    • https://fidedelab.weebly.com/uploads/1/3/4/0/134096197/liboziw-domarorol.pdfIn PDF document text
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/pekukakozulol_rokaxo_gitiwomegajesu.pdfIn PDF document text
    • https://cdn.sqhk.co/litametun/bjijigh/incident_report_letter_sample_in_school.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/e267fa40180c.pdfIn PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/wonaxitodes-fufiximag-xilusolidusefed-xeguzux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 5564 bytes
SHA-256: 9cd4bb10531d59a02be75a413fe55c13aad5ccf65e249e1d6cbb4ceafc4322b9
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 11832 bytes
SHA-256: f9c310bb073b2cec0614175f4d7a53279d8af4ffb238015b7d12a25dd2df2d78

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