Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca04b4369aac1c6…

MALICIOUS

PDF

75.2 KB Created: 2021-02-23 13:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 107ca334a6321444691e14aab7b25478 SHA-1: 7d023f634345905c2b48b0d96bbd817195cb1425 SHA-256: bca04b4369aac1c60bc18cae62b27837143acc7b66e074de2e970135f35da7ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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
  • 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://maypoin.ru/wb?keyword=three%20day%20potty%20training%20pdf PDF link annotation
    • https://cdn.sqhk.co/nixivezez/jdfjjha/portal_mod_for_minecraft_1._16.pdfIn PDF document text
    • https://roxogarafuxor.weebly.com/uploads/1/3/1/1/131164132/6547056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5fef04f71b167.pdfIn PDF document text
    • https://cdn.sqhk.co/belumozobu/hbkidgj/dasajedeladitonos.pdfIn PDF document text
    • http://tumbaa.space/davis_drug_guide_online_discount_codelal50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_600d875ccfae8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489994/normal_5fe44e132356b.pdfIn PDF document text
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/jupufe-navigibaz.pdfIn PDF document text
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/cd1e1.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/4417425.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/tolerofebuj.pdfIn PDF document text
    • https://maxanijalezo.weebly.com/uploads/1/3/2/3/132303118/1f7df0.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/Bwhcuig/gebaduzubiwovulin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_601a5054025d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489725/normal_5fe1ccfb20ef7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377410/normal_5fccafe2ee4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_60104a18a7869.pdfIn PDF document text
    • http://ruszaimclub.ru/salivil6jkq.pdfIn PDF document text
    • http://autobuff.xyz/cara_edit_foto_background_biru_di_androidkqb53.pdfIn PDF document text
    • https://libotavod.weebly.com/uploads/1/3/0/8/130813055/sogetub.pdfIn PDF document text
    • https://xasopivuzag.weebly.com/uploads/1/3/5/3/135333163/6577274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375507/normal_6005c7da23f7a.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_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 5144 bytes
SHA-256: 0c23ce2f26189ab937692c7660467cd6cdf7cb773cb478a9afccdc8f1780740c
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 9920 bytes
SHA-256: aa1e35090fc793f6cd16159b33a3c6a24a8b76f63a1e75eb45f999925061ad20

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